Load pcre-4.0 into code/trunk.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@63 2f5784b3-3f2a-0410-8824-cb99058d5e15

12 files changed, 9966 insertions, 5505 deletions

diff --git a/testdata/testinput1 b/testdata/testinput1
index 66df9b3..02211ac 100644
--- a/testdata/testinput1
+++ b/testdata/testinput1
@@ -1357,7 +1357,7 @@
 
 /^[W-c]+$/
     WXY_^abc
-    ***Failers
+    *** Failers
     wxy
 
 /^[W-c]+$/i
@@ -1517,7 +1517,7 @@
 /(abc)[\1]de/
     abc\1de
 
-/a.b(?s)/
+/(?s)a.b/
     a\nb
 
 /^([^a])([^\b])([^c]*)([^d]{3,4})/
@@ -1947,4 +1947,1877 @@
 /(AB)*\1/
     ABABAB
     
+/(?<!bar)foo/
+    foo
+    catfood
+    arfootle
+    rfoosh
+    *** Failers
+    barfoo
+    towbarfoo
+
+/\w{3}(?<!bar)foo/
+    catfood
+    *** Failers
+    foo
+    barfoo
+    towbarfoo
+
+/(?<=(foo)a)bar/
+    fooabar
+    *** Failers
+    bar
+    foobbar
+      
+/\Aabc\z/m
+    abc
+    *** Failers
+    abc\n   
+    qqq\nabc
+    abc\nzzz
+    qqq\nabc\nzzz
+
+"(?>.*/)foo"
+    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/it/you/see/
+
+"(?>.*/)foo"
+    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
+
+/(?>(\.\d\d[1-9]?))\d+/
+    1.230003938
+    1.875000282
+    *** Failers 
+    1.235 
+
+/^((?>\w+)|(?>\s+))*$/
+    now is the time for all good men to come to the aid of the party
+    *** Failers
+    this is not a line with only words and spaces!
+    
+/(\d+)(\w)/
+    12345a
+    12345+ 
+
+/((?>\d+))(\w)/
+    12345a
+    *** Failers
+    12345+ 
+
+/(?>a+)b/
+    aaab
+
+/((?>a+)b)/
+    aaab
+
+/(?>(a+))b/
+    aaab
+
+/(?>b)+/
+    aaabbbccc
+
+/(?>a+|b+|c+)*c/
+    aaabbbbccccd
+
+/((?>[^()]+)|\([^()]*\))+/
+    ((abc(ade)ufh()()x
+    
+/\(((?>[^()]+)|\([^()]+\))+\)/ 
+    (abc)
+    (abc(def)xyz)
+    *** Failers
+    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
+
+/a(?-i)b/i
+    ab
+    Ab
+    *** Failers 
+    aB
+    AB
+        
+/(a (?x)b c)d e/
+    a bcd e
+    *** Failers
+    a b cd e
+    abcd e   
+    a bcde 
+ 
+/(a b(?x)c d (?-x)e f)/
+    a bcde f
+    *** Failers
+    abcdef  
+
+/(a(?i)b)c/
+    abc
+    aBc
+    *** Failers
+    abC
+    aBC  
+    Abc
+    ABc
+    ABC
+    AbC
+    
+/a(?i:b)c/
+    abc
+    aBc
+    *** Failers 
+    ABC
+    abC
+    aBC
+    
+/a(?i:b)*c/
+    aBc
+    aBBc
+    *** Failers 
+    aBC
+    aBBC
+    
+/a(?=b(?i)c)\w\wd/
+    abcd
+    abCd
+    *** Failers
+    aBCd
+    abcD     
+    
+/(?s-i:more.*than).*million/i
+    more than million
+    more than MILLION
+    more \n than Million 
+    *** Failers
+    MORE THAN MILLION    
+    more \n than \n million 
+
+/(?:(?s-i)more.*than).*million/i
+    more than million
+    more than MILLION
+    more \n than Million 
+    *** Failers
+    MORE THAN MILLION    
+    more \n than \n million 
+    
+/(?>a(?i)b+)+c/ 
+    abc
+    aBbc
+    aBBc 
+    *** Failers
+    Abc
+    abAb    
+    abbC 
+    
+/(?=a(?i)b)\w\wc/
+    abc
+    aBc
+    *** Failers
+    Ab 
+    abC
+    aBC     
+    
+/(?<=a(?i)b)(\w\w)c/
+    abxxc
+    aBxxc
+    *** Failers
+    Abxxc
+    ABxxc
+    abxxC      
+
+/(?:(a)|b)(?(1)A|B)/
+    aA
+    bB
+    *** Failers
+    aB
+    bA    
+
+/^(a)?(?(1)a|b)+$/
+    aa
+    b
+    bb  
+    *** Failers
+    ab   
+
+/^(?(?=abc)\w{3}:|\d\d)$/
+    abc:
+    12
+    *** Failers
+    123
+    xyz    
+
+/^(?(?!abc)\d\d|\w{3}:)$/
+    abc:
+    12
+    *** Failers
+    123
+    xyz    
+    
+/(?(?<=foo)bar|cat)/
+    foobar
+    cat
+    fcat
+    focat   
+    *** Failers
+    foocat  
+
+/(?(?<!foo)cat|bar)/
+    foobar
+    cat
+    fcat
+    focat   
+    *** Failers
+    foocat  
+
+/( \( )? [^()]+ (?(1) \) |) /x
+    abcd
+    (abcd)
+    the quick (abcd) fox
+    (abcd   
+
+/( \( )? [^()]+ (?(1) \) ) /x
+    abcd
+    (abcd)
+    the quick (abcd) fox
+    (abcd   
+
+/^(?(2)a|(1)(2))+$/
+    12
+    12a
+    12aa
+    *** Failers
+    1234    
+
+/((?i)blah)\s+\1/
+    blah blah
+    BLAH BLAH
+    Blah Blah
+    blaH blaH
+    *** Failers
+    blah BLAH
+    Blah blah      
+    blaH blah 
+
+/((?i)blah)\s+(?i:\1)/
+    blah blah
+    BLAH BLAH
+    Blah Blah
+    blaH blaH
+    blah BLAH
+    Blah blah      
+    blaH blah 
+
+/(?>a*)*/
+    a
+    aa
+    aaaa
+    
+/(abc|)+/
+    abc
+    abcabc
+    abcabcabc
+    xyz      
+
+/([a]*)*/
+    a
+    aaaaa 
+ 
+/([ab]*)*/
+    a
+    b
+    ababab
+    aaaabcde
+    bbbb    
+ 
+/([^a]*)*/
+    b
+    bbbb
+    aaa   
+ 
+/([^ab]*)*/
+    cccc
+    abab  
+ 
+/([a]*?)*/
+    a
+    aaaa 
+ 
+/([ab]*?)*/
+    a
+    b
+    abab
+    baba   
+ 
+/([^a]*?)*/
+    b
+    bbbb
+    aaa   
+ 
+/([^ab]*?)*/
+    c
+    cccc
+    baba   
+ 
+/(?>a*)*/
+    a
+    aaabcde 
+ 
+/((?>a*))*/
+    aaaaa
+    aabbaa 
+ 
+/((?>a*?))*/
+    aaaaa
+    aabbaa 
+
+/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /x
+    12-sep-98
+    12-09-98
+    *** Failers
+    sep-12-98
+        
+/(?<=(foo))bar\1/
+    foobarfoo
+    foobarfootling 
+    *** Failers
+    foobar
+    barfoo   
+
+/(?i:saturday|sunday)/
+    saturday
+    sunday
+    Saturday
+    Sunday
+    SATURDAY
+    SUNDAY
+    SunDay
+    
+/(a(?i)bc|BB)x/
+    abcx
+    aBCx
+    bbx
+    BBx
+    *** Failers
+    abcX
+    aBCX
+    bbX
+    BBX               
+
+/^([ab](?i)[cd]|[ef])/
+    ac
+    aC
+    bD
+    elephant
+    Europe 
+    frog
+    France
+    *** Failers
+    Africa     
+
+/^(ab|a(?i)[b-c](?m-i)d|x(?i)y|z)/
+    ab
+    aBd
+    xy
+    xY
+    zebra
+    Zambesi
+    *** Failers
+    aCD  
+    XY  
+
+/(?<=foo\n)^bar/m
+    foo\nbar
+    *** Failers
+    bar
+    baz\nbar   
+
+/(?<=(?<!foo)bar)baz/
+    barbaz
+    barbarbaz 
+    koobarbaz 
+    *** Failers
+    baz
+    foobarbaz 
+
+/The case of aaaaaa is missed out below because I think Perl 5.005_02 gets/
+/it wrong; it sets $1 to aaa rather than aa. Compare the following test,/
+/where it does set $1 to aa when matching aaaaaa./
+
+/^(a\1?){4}$/
+    a
+    aa
+    aaa
+    aaaa
+    aaaaa
+    aaaaaaa
+    aaaaaaaa
+    aaaaaaaaa
+    aaaaaaaaaa
+    aaaaaaaaaaa
+    aaaaaaaaaaaa
+    aaaaaaaaaaaaa
+    aaaaaaaaaaaaaa
+    aaaaaaaaaaaaaaa
+    aaaaaaaaaaaaaaaa               
+
+/^(a\1?)(a\1?)(a\2?)(a\3?)$/
+    a
+    aa
+    aaa
+    aaaa
+    aaaaa
+    aaaaaa
+    aaaaaaa
+    aaaaaaaa
+    aaaaaaaaa
+    aaaaaaaaaa
+    aaaaaaaaaaa
+    aaaaaaaaaaaa
+    aaaaaaaaaaaaa
+    aaaaaaaaaaaaaa
+    aaaaaaaaaaaaaaa
+    aaaaaaaaaaaaaaaa               
+
+/The following tests are taken from the Perl 5.005 test suite; some of them/
+/are compatible with 5.004, but I'd rather not have to sort them out./
+
+/abc/
+    abc
+    xabcy
+    ababc
+    *** Failers
+    xbc
+    axc
+    abx
+
+/ab*c/
+    abc
+
+/ab*bc/
+    abc
+    abbc
+    abbbbc
+
+/.{1}/
+    abbbbc
+
+/.{3,4}/
+    abbbbc
+
+/ab{0,}bc/
+    abbbbc
+
+/ab+bc/
+    abbc
+    *** Failers
+    abc
+    abq
+
+/ab{1,}bc/
+
+/ab+bc/
+    abbbbc
+
+/ab{1,}bc/
+    abbbbc
+
+/ab{1,3}bc/
+    abbbbc
+
+/ab{3,4}bc/
+    abbbbc
+
+/ab{4,5}bc/
+    *** Failers
+    abq
+    abbbbc
+
+/ab?bc/
+    abbc
+    abc
+
+/ab{0,1}bc/
+    abc
+
+/ab?bc/
+
+/ab?c/
+    abc
+
+/ab{0,1}c/
+    abc
+
+/^abc$/
+    abc
+    *** Failers
+    abbbbc
+    abcc
+
+/^abc/
+    abcc
+
+/^abc$/
+
+/abc$/
+    aabc
+    *** Failers
+    aabc
+    aabcd
+
+/^/
+    abc
+
+/$/
+    abc
+
+/a.c/
+    abc
+    axc
+
+/a.*c/
+    axyzc
+
+/a[bc]d/
+    abd
+    *** Failers
+    axyzd
+    abc
+
+/a[b-d]e/
+    ace
+
+/a[b-d]/
+    aac
+
+/a[-b]/
+    a-
+
+/a[b-]/
+    a-
+
+/a]/
+    a]
+
+/a[]]b/
+    a]b
+
+/a[^bc]d/
+    aed
+    *** Failers
+    abd
+    abd
+
+/a[^-b]c/
+    adc
+
+/a[^]b]c/
+    adc
+    *** Failers
+    a-c
+    a]c
+
+/\ba\b/
+    a-
+    -a
+    -a-
+
+/\by\b/
+    *** Failers
+    xy
+    yz
+    xyz
+
+/\Ba\B/
+    *** Failers
+    a-
+    -a
+    -a-
+
+/\By\b/
+    xy
+
+/\by\B/
+    yz
+
+/\By\B/
+    xyz
+
+/\w/
+    a
+
+/\W/
+    -
+    *** Failers
+    -
+    a
+
+/a\sb/
+    a b
+
+/a\Sb/
+    a-b
+    *** Failers
+    a-b
+    a b
+
+/\d/
+    1
+
+/\D/
+    -
+    *** Failers
+    -
+    1
+
+/[\w]/
+    a
+
+/[\W]/
+    -
+    *** Failers
+    -
+    a
+
+/a[\s]b/
+    a b
+
+/a[\S]b/
+    a-b
+    *** Failers
+    a-b
+    a b
+
+/[\d]/
+    1
+
+/[\D]/
+    -
+    *** Failers
+    -
+    1
+
+/ab|cd/
+    abc
+    abcd
+
+/()ef/
+    def
+
+/$b/
+
+/a\(b/
+    a(b
+
+/a\(*b/
+    ab
+    a((b
+
+/a\\b/
+    a\b
+
+/((a))/
+    abc
+
+/(a)b(c)/
+    abc
+
+/a+b+c/
+    aabbabc
+
+/a{1,}b{1,}c/
+    aabbabc
+
+/a.+?c/
+    abcabc
+
+/(a+|b)*/
+    ab
+
+/(a+|b){0,}/
+    ab
+
+/(a+|b)+/
+    ab
+
+/(a+|b){1,}/
+    ab
+
+/(a+|b)?/
+    ab
+
+/(a+|b){0,1}/
+    ab
+
+/[^ab]*/
+    cde
+
+/abc/
+    *** Failers
+    b
+    
+
+/a*/
+    
+
+/([abc])*d/
+    abbbcd
+
+/([abc])*bcd/
+    abcd
+
+/a|b|c|d|e/
+    e
+
+/(a|b|c|d|e)f/
+    ef
+
+/abcd*efg/
+    abcdefg
+
+/ab*/
+    xabyabbbz
+    xayabbbz
+
+/(ab|cd)e/
+    abcde
+
+/[abhgefdc]ij/
+    hij
+
+/^(ab|cd)e/
+
+/(abc|)ef/
+    abcdef
+
+/(a|b)c*d/
+    abcd
+
+/(ab|ab*)bc/
+    abc
+
+/a([bc]*)c*/
+    abc
+
+/a([bc]*)(c*d)/
+    abcd
+
+/a([bc]+)(c*d)/
+    abcd
+
+/a([bc]*)(c+d)/
+    abcd
+
+/a[bcd]*dcdcde/
+    adcdcde
+
+/a[bcd]+dcdcde/
+    *** Failers
+    abcde
+    adcdcde
+
+/(ab|a)b*c/
+    abc
+
+/((a)(b)c)(d)/
+    abcd
+
+/[a-zA-Z_][a-zA-Z0-9_]*/
+    alpha
+
+/^a(bc+|b[eh])g|.h$/
+    abh
+
+/(bc+d$|ef*g.|h?i(j|k))/
+    effgz
+    ij
+    reffgz
+    *** Failers
+    effg
+    bcdd
+
+/((((((((((a))))))))))/
+    a
+
+/((((((((((a))))))))))\10/
+    aa
+
+/(((((((((a)))))))))/
+    a
+
+/multiple words of text/
+    *** Failers
+    aa
+    uh-uh
+
+/multiple words/
+    multiple words, yeah
+
+/(.*)c(.*)/
+    abcde
+
+/\((.*), (.*)\)/
+    (a, b)
+
+/[k]/
+
+/abcd/
+    abcd
+
+/a(bc)d/
+    abcd
+
+/a[-]?c/
+    ac
+
+/(abc)\1/
+    abcabc
+
+/([a-c]*)\1/
+    abcabc
+
+/(a)|\1/
+    a
+    *** Failers
+    ab
+    x
+
+/(([a-c])b*?\2)*/
+    ababbbcbc
+
+/(([a-c])b*?\2){3}/
+    ababbbcbc
+
+/((\3|b)\2(a)x)+/
+    aaaxabaxbaaxbbax
+
+/((\3|b)\2(a)){2,}/
+    bbaababbabaaaaabbaaaabba
+
+/abc/i
+    ABC
+    XABCY
+    ABABC
+    *** Failers
+    aaxabxbaxbbx
+    XBC
+    AXC
+    ABX
+
+/ab*c/i
+    ABC
+
+/ab*bc/i
+    ABC
+    ABBC
+
+/ab*?bc/i
+    ABBBBC
+
+/ab{0,}?bc/i
+    ABBBBC
+
+/ab+?bc/i
+    ABBC
+
+/ab+bc/i
+    *** Failers
+    ABC
+    ABQ
+
+/ab{1,}bc/i
+
+/ab+bc/i
+    ABBBBC
+
+/ab{1,}?bc/i
+    ABBBBC
+
+/ab{1,3}?bc/i
+    ABBBBC
+
+/ab{3,4}?bc/i
+    ABBBBC
+
+/ab{4,5}?bc/i
+    *** Failers
+    ABQ
+    ABBBBC
+
+/ab??bc/i
+    ABBC
+    ABC
+
+/ab{0,1}?bc/i
+    ABC
+
+/ab??bc/i
+
+/ab??c/i
+    ABC
+
+/ab{0,1}?c/i
+    ABC
+
+/^abc$/i
+    ABC
+    *** Failers
+    ABBBBC
+    ABCC
+
+/^abc/i
+    ABCC
+
+/^abc$/i
+
+/abc$/i
+    AABC
+
+/^/i
+    ABC
+
+/$/i
+    ABC
+
+/a.c/i
+    ABC
+    AXC
+
+/a.*?c/i
+    AXYZC
+
+/a.*c/i
+    *** Failers
+    AABC
+    AXYZD
+
+/a[bc]d/i
+    ABD
+
+/a[b-d]e/i
+    ACE
+    *** Failers
+    ABC
+    ABD
+
+/a[b-d]/i
+    AAC
+
+/a[-b]/i
+    A-
+
+/a[b-]/i
+    A-
+
+/a]/i
+    A]
+
+/a[]]b/i
+    A]B
+
+/a[^bc]d/i
+    AED
+
+/a[^-b]c/i
+    ADC
+    *** Failers
+    ABD
+    A-C
+
+/a[^]b]c/i
+    ADC
+
+/ab|cd/i
+    ABC
+    ABCD
+
+/()ef/i
+    DEF
+
+/$b/i
+    *** Failers
+    A]C
+    B
+
+/a\(b/i
+    A(B
+
+/a\(*b/i
+    AB
+    A((B
+
+/a\\b/i
+    A\B
+
+/((a))/i
+    ABC
+
+/(a)b(c)/i
+    ABC
+
+/a+b+c/i
+    AABBABC
+
+/a{1,}b{1,}c/i
+    AABBABC
+
+/a.+?c/i
+    ABCABC
+
+/a.*?c/i
+    ABCABC
+
+/a.{0,5}?c/i
+    ABCABC
+
+/(a+|b)*/i
+    AB
+
+/(a+|b){0,}/i
+    AB
+
+/(a+|b)+/i
+    AB
+
+/(a+|b){1,}/i
+    AB
+
+/(a+|b)?/i
+    AB
+
+/(a+|b){0,1}/i
+    AB
+
+/(a+|b){0,1}?/i
+    AB
+
+/[^ab]*/i
+    CDE
+
+/abc/i
+
+/a*/i
+    
+
+/([abc])*d/i
+    ABBBCD
+
+/([abc])*bcd/i
+    ABCD
+
+/a|b|c|d|e/i
+    E
+
+/(a|b|c|d|e)f/i
+    EF
+
+/abcd*efg/i
+    ABCDEFG
+
+/ab*/i
+    XABYABBBZ
+    XAYABBBZ
+
+/(ab|cd)e/i
+    ABCDE
+
+/[abhgefdc]ij/i
+    HIJ
+
+/^(ab|cd)e/i
+    ABCDE
+
+/(abc|)ef/i
+    ABCDEF
+
+/(a|b)c*d/i
+    ABCD
+
+/(ab|ab*)bc/i
+    ABC
+
+/a([bc]*)c*/i
+    ABC
+
+/a([bc]*)(c*d)/i
+    ABCD
+
+/a([bc]+)(c*d)/i
+    ABCD
+
+/a([bc]*)(c+d)/i
+    ABCD
+
+/a[bcd]*dcdcde/i
+    ADCDCDE
+
+/a[bcd]+dcdcde/i
+
+/(ab|a)b*c/i
+    ABC
+
+/((a)(b)c)(d)/i
+    ABCD
+
+/[a-zA-Z_][a-zA-Z0-9_]*/i
+    ALPHA
+
+/^a(bc+|b[eh])g|.h$/i
+    ABH
+
+/(bc+d$|ef*g.|h?i(j|k))/i
+    EFFGZ
+    IJ
+    REFFGZ
+    *** Failers
+    ADCDCDE
+    EFFG
+    BCDD
+
+/((((((((((a))))))))))/i
+    A
+
+/((((((((((a))))))))))\10/i
+    AA
+
+/(((((((((a)))))))))/i
+    A
+
+/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/i
+    A
+
+/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/i
+    C
+
+/multiple words of text/i
+    *** Failers
+    AA
+    UH-UH
+
+/multiple words/i
+    MULTIPLE WORDS, YEAH
+
+/(.*)c(.*)/i
+    ABCDE
+
+/\((.*), (.*)\)/i
+    (A, B)
+
+/[k]/i
+
+/abcd/i
+    ABCD
+
+/a(bc)d/i
+    ABCD
+
+/a[-]?c/i
+    AC
+
+/(abc)\1/i
+    ABCABC
+
+/([a-c]*)\1/i
+    ABCABC
+
+/a(?!b)./
+    abad
+
+/a(?=d)./
+    abad
+
+/a(?=c|d)./
+    abad
+
+/a(?:b|c|d)(.)/
+    ace
+
+/a(?:b|c|d)*(.)/
+    ace
+
+/a(?:b|c|d)+?(.)/
+    ace
+    acdbcdbe
+
+/a(?:b|c|d)+(.)/
+    acdbcdbe
+
+/a(?:b|c|d){2}(.)/
+    acdbcdbe
+
+/a(?:b|c|d){4,5}(.)/
+    acdbcdbe
+
+/a(?:b|c|d){4,5}?(.)/
+    acdbcdbe
+
+/((foo)|(bar))*/
+    foobar
+
+/a(?:b|c|d){6,7}(.)/
+    acdbcdbe
+
+/a(?:b|c|d){6,7}?(.)/
+    acdbcdbe
+
+/a(?:b|c|d){5,6}(.)/
+    acdbcdbe
+
+/a(?:b|c|d){5,6}?(.)/
+    acdbcdbe
+
+/a(?:b|c|d){5,7}(.)/
+    acdbcdbe
+
+/a(?:b|c|d){5,7}?(.)/
+    acdbcdbe
+
+/a(?:b|(c|e){1,2}?|d)+?(.)/
+    ace
+
+/^(.+)?B/
+    AB
+
+/^([^a-z])|(\^)$/
+    .
+
+/^[<>]&/
+    <&OUT
+
+/^(a\1?){4}$/
+    aaaaaaaaaa
+    *** Failers
+    AB
+    aaaaaaaaa
+    aaaaaaaaaaa
+
+/^(a(?(1)\1)){4}$/
+    aaaaaaaaaa
+    *** Failers
+    aaaaaaaaa
+    aaaaaaaaaaa
+
+/(?:(f)(o)(o)|(b)(a)(r))*/
+    foobar
+
+/(?<=a)b/
+    ab
+    *** Failers
+    cb
+    b
+
+/(?<!c)b/
+    ab
+    b
+    b
+
+/(?:..)*a/
+    aba
+
+/(?:..)*?a/
+    aba
+
+/^(?:b|a(?=(.)))*\1/
+    abc
+
+/^(){3,5}/
+    abc
+
+/^(a+)*ax/
+    aax
+
+/^((a|b)+)*ax/
+    aax
+
+/^((a|bc)+)*ax/
+    aax
+
+/(a|x)*ab/
+    cab
+
+/(a)*ab/
+    cab
+
+/(?:(?i)a)b/
+    ab
+
+/((?i)a)b/
+    ab
+
+/(?:(?i)a)b/
+    Ab
+
+/((?i)a)b/
+    Ab
+
+/(?:(?i)a)b/
+    *** Failers
+    cb
+    aB
+
+/((?i)a)b/
+
+/(?i:a)b/
+    ab
+
+/((?i:a))b/
+    ab
+
+/(?i:a)b/
+    Ab
+
+/((?i:a))b/
+    Ab
+
+/(?i:a)b/
+    *** Failers
+    aB
+    aB
+
+/((?i:a))b/
+
+/(?:(?-i)a)b/i
+    ab
+
+/((?-i)a)b/i
+    ab
+
+/(?:(?-i)a)b/i
+    aB
+
+/((?-i)a)b/i
+    aB
+
+/(?:(?-i)a)b/i
+    *** Failers
+    aB
+    Ab
+
+/((?-i)a)b/i
+
+/(?:(?-i)a)b/i
+    aB
+
+/((?-i)a)b/i
+    aB
+
+/(?:(?-i)a)b/i
+    *** Failers
+    Ab
+    AB
+
+/((?-i)a)b/i
+
+/(?-i:a)b/i
+    ab
+
+/((?-i:a))b/i
+    ab
+
+/(?-i:a)b/i
+    aB
+
+/((?-i:a))b/i
+    aB
+
+/(?-i:a)b/i
+    *** Failers
+    AB
+    Ab
+
+/((?-i:a))b/i
+
+/(?-i:a)b/i
+    aB
+
+/((?-i:a))b/i
+    aB
+
+/(?-i:a)b/i
+    *** Failers
+    Ab
+    AB
+
+/((?-i:a))b/i
+
+/((?-i:a.))b/i
+    *** Failers
+    AB
+    a\nB
+
+/((?s-i:a.))b/i
+    a\nB
+
+/(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))/
+    cabbbb
+
+/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/
+    caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+
+/(ab)\d\1/i
+    Ab4ab
+    ab4Ab
+
+/foo\w*\d{4}baz/
+    foobar1234baz
+
+/x(~~)*(?:(?:F)?)?/
+    x~~
+
+/^a(?#xxx){3}c/
+    aaac
+
+/^a (?#xxx) (?#yyy) {3}c/x
+    aaac
+
+/(?<![cd])b/
+    *** Failers
+    B\nB
+    dbcb
+
+/(?<![cd])[ab]/
+    dbaacb
+
+/(?<!(c|d))b/
+
+/(?<!(c|d))[ab]/
+    dbaacb
+
+/(?<!cd)[ab]/
+    cdaccb
+
+/^(?:a?b?)*$/
+    *** Failers
+    dbcb
+    a--
+
+/((?s)^a(.))((?m)^b$)/
+    a\nb\nc\n
+
+/((?m)^b$)/
+    a\nb\nc\n
+
+/(?m)^b/
+    a\nb\n
+
+/(?m)^(b)/
+    a\nb\n
+
+/((?m)^b)/
+    a\nb\n
+
+/\n((?m)^b)/
+    a\nb\n
+
+/((?s).)c(?!.)/
+    a\nb\nc\n
+    a\nb\nc\n
+
+/((?s)b.)c(?!.)/
+    a\nb\nc\n
+    a\nb\nc\n
+
+/^b/
+
+/()^b/
+    *** Failers
+    a\nb\nc\n
+    a\nb\nc\n
+
+/((?m)^b)/
+    a\nb\nc\n
+
+/(?(1)a|b)/
+
+/(?(1)b|a)/
+    a
+
+/(x)?(?(1)a|b)/
+    *** Failers
+    a
+    a
+
+/(x)?(?(1)b|a)/
+    a
+
+/()?(?(1)b|a)/
+    a
+
+/()(?(1)b|a)/
+
+/()?(?(1)a|b)/
+    a
+
+/^(\()?blah(?(1)(\)))$/
+    (blah)
+    blah
+    *** Failers
+    a
+    blah)
+    (blah
+
+/^(\(+)?blah(?(1)(\)))$/
+    (blah)
+    blah
+    *** Failers
+    blah)
+    (blah
+
+/(?(?!a)a|b)/
+
+/(?(?!a)b|a)/
+    a
+
+/(?(?=a)b|a)/
+    *** Failers
+    a
+    a
+
+/(?(?=a)a|b)/
+    a
+
+/(?=(a+?))(\1ab)/
+    aaab
+
+/^(?=(a+?))\1ab/
+
+/(\w+:)+/
+    one:
+
+/$(?<=^(a))/
+    a
+
+/(?=(a+?))(\1ab)/
+    aaab
+
+/^(?=(a+?))\1ab/
+    *** Failers
+    aaab
+    aaab
+
+/([\w:]+::)?(\w+)$/
+    abcd
+    xy:z:::abcd
+
+/^[^bcd]*(c+)/
+    aexycd
+
+/(a*)b+/
+    caab
+
+/([\w:]+::)?(\w+)$/
+    abcd
+    xy:z:::abcd
+    *** Failers
+    abcd:
+    abcd:
+
+/^[^bcd]*(c+)/
+    aexycd
+
+/(>a+)ab/
+
+/(?>a+)b/
+    aaab
+
+/([[:]+)/
+    a:[b]:
+
+/([[=]+)/
+    a=[b]=
+
+/([[.]+)/
+    a.[b].
+
+/((?>a+)b)/
+    aaab
+
+/(?>(a+))b/
+    aaab
+
+/((?>[^()]+)|\([^()]*\))+/
+    ((abc(ade)ufh()()x
+
+/a\Z/
+    *** Failers
+    aaab
+    a\nb\n
+
+/b\Z/
+    a\nb\n
+
+/b\z/
+
+/b\Z/
+    a\nb
+
+/b\z/
+    a\nb
+    *** Failers
+    
+/^(?>(?(1)\.|())[^\W_](?>[a-z0-9-]*[^\W_])?)+$/
+    a
+    abc
+    a-b
+    0-9 
+    a.b
+    5.6.7  
+    the.quick.brown.fox
+    a100.b200.300c  
+    12-ab.1245 
+    *** Failers
+    \
+    .a
+    -a
+    a-
+    a.  
+    a_b 
+    a.-
+    a..  
+    ab..bc 
+    the.quick.brown.fox-
+    the.quick.brown.fox.
+    the.quick.brown.fox_
+    the.quick.brown.fox+       
+
+/(?>.*)(?<=(abcd|wxyz))/
+    alphabetabcd
+    endingwxyz
+    *** Failers
+    a rather long string that doesn't end with one of them
+
+/word (?>(?:(?!otherword)[a-zA-Z0-9]+ ){0,30})otherword/
+    word cat dog elephant mussel cow horse canary baboon snake shark otherword
+    word cat dog elephant mussel cow horse canary baboon snake shark
+  
+/word (?>[a-zA-Z0-9]+ ){0,30}otherword/
+    word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope
+
+/(?<=\d{3}(?!999))foo/
+    999foo
+    123999foo 
+    *** Failers
+    123abcfoo
+    
+/(?<=(?!...999)\d{3})foo/
+    999foo
+    123999foo 
+    *** Failers
+    123abcfoo
+
+/(?<=\d{3}(?!999)...)foo/
+    123abcfoo
+    123456foo 
+    *** Failers
+    123999foo  
+    
+/(?<=\d{3}...)(?<!999)foo/
+    123abcfoo   
+    123456foo 
+    *** Failers
+    123999foo  
+
+/<a[\s]+href[\s]*=[\s]*          # find <a href=
+ ([\"\'])?                       # find single or double quote
+ (?(1) (.*?)\1 | ([^\s]+))       # if quote found, match up to next matching
+                                 # quote, otherwise match up to next space
+/isx
+    <a href=abcd xyz
+    <a href=\"abcd xyz pqr\" cats
+    <a href=\'abcd xyz pqr\' cats
+
+/<a\s+href\s*=\s*                # find <a href=
+ (["'])?                         # find single or double quote
+ (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
+                                 # quote, otherwise match up to next space
+/isx
+    <a href=abcd xyz
+    <a href=\"abcd xyz pqr\" cats
+    <a href       =       \'abcd xyz pqr\' cats
+
+/<a\s+href(?>\s*)=(?>\s*)        # find <a href=
+ (["'])?                         # find single or double quote
+ (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
+                                 # quote, otherwise match up to next space
+/isx
+    <a href=abcd xyz
+    <a href=\"abcd xyz pqr\" cats
+    <a href       =       \'abcd xyz pqr\' cats
+
+/((Z)+|A)*/
+    ZABCDEFG
+
+/(Z()|A)*/
+    ZABCDEFG
+
+/(Z(())|A)*/
+    ZABCDEFG
+
+/((?>Z)+|A)*/
+    ZABCDEFG
+
+/((?>)+|A)*/
+    ZABCDEFG
+
+/a*/g
+    abbab
+
+/^[a-\d]/
+    abcde
+    -things
+    0digit
+    *** Failers
+    bcdef    
+
+/^[\d-a]/
+    abcde
+    -things
+    0digit
+    *** Failers
+    bcdef    
+    
+/[[:space:]]+/
+    > \x09\x0a\x0c\x0d\x0b<
+     
+/[[:blank:]]+/
+    > \x09\x0a\x0c\x0d\x0b<
+     
+/[\s]+/
+    > \x09\x0a\x0c\x0d\x0b<
+     
+/\s+/
+    > \x09\x0a\x0c\x0d\x0b<
+     
+/ab/x
+    ab
+
+/(?!\A)x/m
+  a\nxb\n
+
+/(?!^)x/m
+  a\nxb\n
+
+/abc\Qabc\Eabc/
+    abcabcabc
+    
+/abc\Q(*+|\Eabc/
+    abc(*+|abc 
+
+/   abc\Q abc\Eabc/x
+    abc abcabc
+    *** Failers
+    abcabcabc  
+    
+/abc#comment
+    \Q#not comment
+    literal\E/x
+    abc#not comment\n    literal     
+
+/abc#comment
+    \Q#not comment
+    literal/x
+    abc#not comment\n    literal     
+
+/abc#comment
+    \Q#not comment
+    literal\E #more comment
+    /x
+    abc#not comment\n    literal     
+
+/abc#comment
+    \Q#not comment
+    literal\E #more comment/x
+    abc#not comment\n    literal     
+
+/\Qabc\$xyz\E/
+    abc\\\$xyz
+
+/\Qabc\E\$\Qxyz\E/
+    abc\$xyz
+
+/\Gabc/
+    abc
+    *** Failers
+    xyzabc  
+
+/\Gabc./g
+    abc1abc2xyzabc3
+
+/abc./g
+    abc1abc2xyzabc3 
+
+/a(?x: b c )d/
+    XabcdY
+    *** Failers 
+    Xa b c d Y 
+
+/((?x)x y z | a b c)/
+    XabcY
+    AxyzB 
+
+/(?i)AB(?-i)C/
+    XabCY
+    *** Failers
+    XabcY  
+
+/((?i)AB(?-i)C|D)E/
+    abCE
+    DE
+    *** Failers
+    abcE
+    abCe  
+    dE
+    De    
+
+/(.*)\d+\1/
+    abc123abc
+    abc123bc 
+
+/(.*)\d+\1/s
+    abc123abc
+    abc123bc 
+    
+/((.*))\d+\1/
+    abc123abc
+    abc123bc  
+
+/-- This tests for an IPv6 address in the form where it can have up to --/
+/-- eight components, one and only one of which is empty. This must be --/
+/-- an internal component. --/
+
+/^(?!:)                       # colon disallowed at start
+  (?:                         # start of item
+    (?: [0-9a-f]{1,4} |       # 1-4 hex digits or
+    (?(1)0 | () ) )           # if null previously matched, fail; else null
+    :                         # followed by colon
+  ){1,7}                      # end item; 1-7 of them required               
+  [0-9a-f]{1,4} $             # final hex number at end of string
+  (?(1)|.)                    # check that there was an empty component
+  /xi
+    a123::a123
+    a123:b342::abcd
+    a123:b342::324e:abcd
+    a123:ddde:b342::324e:abcd
+    a123:ddde:b342::324e:dcba:abcd
+    a123:ddde:9999:b342::324e:dcba:abcd
+    *** Failers
+    1:2:3:4:5:6:7:8
+    a123:bce:ddde:9999:b342::324e:dcba:abcd
+    a123::9999:b342::324e:dcba:abcd
+    abcde:2:3:4:5:6:7:8
+    ::1
+    abcd:fee0:123::   
+    :1
+    1:  
+
+/[z\Qa-d]\E]/
+    z
+    a
+    -
+    d
+    ] 
+    *** Failers
+    b     
+
+/[\z\C]/
+    z
+    C 
+    
+/\M/
+    M 
+    
 / End of testinput1 /
diff --git a/testdata/testinput2 b/testdata/testinput2
index f41478e..d46546a 100644
--- a/testdata/testinput2
+++ b/testdata/testinput2
@@ -38,7 +38,7 @@
 
 /[abcd/
 
-/[\B]/
+/(?X)[\B]/
 
 /[z-a]/
 
@@ -173,7 +173,7 @@
 /<.*>/U
     abc<def>ghi<klm>nop
     
-/<.*>(?U)/
+/(?U)<.*>/
     abc<def>ghi<klm>nop
 
 /<.*?>/U
@@ -658,6 +658,8 @@
              
 /^[[:ascii:]]/D
 
+/^[[:blank:]]/D
+
 /^[[:cntrl:]]/D
 
 /^[[:digit:]]/D
@@ -682,6 +684,8 @@
 
 /^[12[:^digit:]]/D
 
+/^[[:^blank:]]/D
+
 /[01[:alpha:]%]/D
 
 /[[.ch.]]/
@@ -720,4 +724,505 @@
     mainmain
     mainOmain
     
+/These are all cases where Perl does it differently (nested captures)/
+
+/^(a(b)?)+$/
+    aba
+   
+/^(aa(bb)?)+$/
+    aabbaa    
+    
+/^(aa|aa(bb))+$/
+    aabbaa 
+    
+/^(aa(bb)??)+$/
+    aabbaa    
+    
+/^(?:aa(bb)?)+$/
+    aabbaa    
+    
+/^(aa(b(b))?)+$/
+    aabbaa    
+
+/^(?:aa(b(b))?)+$/
+    aabbaa    
+
+/^(?:aa(b(?:b))?)+$/
+    aabbaa    
+
+/^(?:aa(bb(?:b))?)+$/
+    aabbbaa    
+    
+/^(?:aa(b(?:bb))?)+$/
+    aabbbaa    
+
+/^(?:aa(?:b(b))?)+$/
+    aabbaa    
+
+/^(?:aa(?:b(bb))?)+$/
+    aabbbaa    
+
+/^(aa(b(bb))?)+$/
+    aabbbaa    
+
+/^(aa(bb(bb))?)+$/
+    aabbbbaa    
+
+/--------------------------------------------------------------------/ 
+    
+/#/xMD
+
+/a#/xMD
+
+/[\s]/D
+
+/[\S]/D
+
+/a(?i)b/D
+    ab
+    aB
+    *** Failers 
+    AB  
+
+/(a(?i)b)/D
+    ab
+    aB
+    *** Failers 
+    AB  
+    
+/   (?i)abc/xD
+
+/#this is a comment
+  (?i)abc/xD
+
+/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/D
+
+/\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/D
+
+/\Q\E/D
+    \
+
+/\Q\Ex/D
+
+/ \Q\E/D
+
+/a\Q\E/D
+  abc
+  bca
+  bac  
+
+/a\Q\Eb/D
+  abc
+
+/\Q\Eabc/D
+
+/x*+\w/D
+    *** Failers
+    xxxxx
+    
+/x?+/D
+
+/x++/D
+
+/x{1,3}+/D 
+
+/(x)*+/D
+
+/^(\w++|\s++)*$/
+    now is the time for all good men to come to the aid of the party
+    *** Failers
+    this is not a line with only words and spaces!
+    
+/(\d++)(\w)/
+    12345a
+    *** Failers
+    12345+ 
+
+/a++b/
+    aaab
+
+/(a++b)/
+    aaab
+
+/(a++)b/
+    aaab
+
+/([^()]++|\([^()]*\))+/
+    ((abc(ade)ufh()()x
+    
+/\(([^()]++|\([^()]+\))+\)/ 
+    (abc)
+    (abc(def)xyz)
+    *** Failers
+    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
+
+/(abc){1,3}+/D
+
+/a+?+/
+
+/a{2,3}?+b/
+
+/(?U)a+?+/
+
+/a{2,3}?+b/U
+
+/x(?U)a++b/D
+    xaaaab
+
+/(?U)xa++b/D
+    xaaaab
+
+/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/D
+
+/^x(?U)a+b/D
+
+/^x(?U)(a+)b/D
+
+/[.x.]/
+
+/[=x=]/
+
+/[:x:]/
+
+/\l/
+
+/\L/
+
+/\N{name}/
+
+/\pP/
+
+/\PP/
+
+/\p{prop}/
+
+/\P{prop}/
+
+/\u/
+
+/\U/
+
+/\X/
+
+/[/
+
+/[a-/
+
+/[[:space:]/
+
+/[\s]/DM
+
+/[[:space:]]/DM
+
+/[[:space:]abcde]/DM
+
+/< (?: (?(R) \d++  | [^<>]*+) | (?R)) * >/x
+    <>
+    <abcd>
+    <abc <123> hij>
+    <abc <def> hij>
+    <abc<>def> 
+    <abc<>      
+    *** Failers
+    <abc
+
+|8J\$WE\<\.rX\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|DM
+
+|\$\<\.X\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|DM
+
+/(.*)\d+\1/I
+
+/(.*)\d+/I
+    
+/(.*)\d+\1/Is
+
+/(.*)\d+/Is
+
+/(.*(xyz))\d+\2/I
+
+/((.*))\d+\1/I
+    abc123bc
+    
+/a[b]/I
+
+/(?=a).*/I
+
+/(?=abc).xyz/iI
+
+/(?=abc)(?i).xyz/I
+
+/(?=a)(?=b)/I
+
+/(?=.)a/I
+
+/((?=abcda)a)/I
+
+/((?=abcda)ab)/I
+
+/()a/I
+
+/(?(1)ab|ac)/I
+
+/(?(1)abz|acz)/I
+
+/(?(1)abz)/I
+
+/(?(1)abz)123/I
+
+/(a)+/I
+
+/(a){2,3}/I
+
+/(a)*/I
+
+/[a]/I
+
+/[ab]/I
+
+/[ab]/IS
+
+/[^a]/I
+
+/\d456/I
+
+/\d456/IS
+
+/a^b/I
+
+/^a/mI
+  abcde
+  xy\nabc 
+  *** Failers 
+  xyabc 
+
+/c|abc/I
+
+/(?i)[ab]/IS
+
+/[ab](?i)cd/IS
+
+/abc(?C)def/
+    abcdef
+    1234abcdef 
+    *** Failers
+    abcxyz
+    abcxyzf   
+
+/abc(?C)de(?C1)f/
+    123abcdef
+    
+/(?C1)\dabc(?C2)def/ 
+    1234abcdef
+    *** Failers
+    abcdef 
+    
+/(?C255)ab/
+
+/(?C256)ab/
+
+/(?Cab)xx/ 
+
+/(?C12vr)x/
+
+/abc(?C)def/
+    *** Failers
+    \x83\x0\x61bcdef
+
+/(abc)(?C)de(?C1)f/
+    123abcdef
+    123abcdef\C+ 
+    123abcdef\C- 
+    *** Failers
+    123abcdef\C!1 
+    
+/(?C0)(abc(?C1))*/
+    abcabcabc
+    abcabc\C!1!3   
+    *** Failers
+    abcabcabc\C!1!3   
+
+/(\d{3}(?C))*/
+    123\C+
+    123456\C+
+    123456789\C+  
+
+/((xyz)(?C)p|(?C1)xyzabc)/
+    xyzabc\C+
+
+/(X)((xyz)(?C)p|(?C1)xyzabc)/
+    Xxyzabc\C+
+
+/(?=(abc))(?C)abcdef/
+    abcdef\C+
+    
+/(?!(abc)(?C1)d)(?C2)abcxyz/
+    abcxyz\C+ 
+
+/(?<=(abc)(?C))xyz/
+   abcxyz\C+
+   
+/(?C)abc/ 
+
+/(?C)^abc/
+
+/(?C)a|b/S
+
+/(?R)/
+
+/(a|(?R))/
+
+/(ab|(bc|(de|(?R))))/
+
+/x(ab|(bc|(de|(?R))))/
+    xab
+    xbc
+    xde
+    xxab
+    xxxab
+    *** Failers
+    xyab   
+
+/(ab|(bc|(de|(?1))))/
+
+/x(ab|(bc|(de|(?1)x)x)x)/
+
+/^([^()]|\((?1)*\))*$/
+    abc
+    a(b)c
+    a(b(c))d  
+    *** Failers)
+    a(b(c)d  
+
+/^>abc>([^()]|\((?1)*\))*<xyz<$/
+   >abc>123<xyz<
+   >abc>1(2)3<xyz<
+   >abc>(1(2)3)<xyz<
+
+/(a(?1)b)/D
+
+/(a(?1)+b)/D
+
+/^\W*(?:((.)\W*(?1)\W*\2|)|((.)\W*(?3)\W*\4|\W*.\W*))\W*$/i
+    1221
+    Satan, oscillate my metallic sonatas!
+    A man, a plan, a canal: Panama!
+    Able was I ere I saw Elba. 
+    *** Failers
+    The quick brown fox  
+    
+/^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/
+    12
+    (((2+2)*-3)-7)
+    -12
+    *** Failers
+    ((2+2)*-3)-7)
+         
+/^(x(y|(?1){2})z)/
+    xyz
+    xxyzxyzz 
+    *** Failers
+    xxyzz
+    xxyzxyzxyzz   
+
+/((< (?: (?(R) \d++  | [^<>]*+) | (?2)) * >))/x
+    <>
+    <abcd>
+    <abc <123> hij>
+    <abc <def> hij>
+    <abc<>def> 
+    <abc<>      
+    *** Failers
+    <abc
+
+/(?1)/
+
+/((?2)(abc)/
+
+/^(abc)def(?1)/
+    abcdefabc
+
+/^(a|b|c)=(?1)+/
+    a=a
+    a=b
+    a=bc  
+
+/^(a|b|c)=((?1))+/
+    a=a
+    a=b
+    a=bc  
+
+/a(?P<name1>b|c)d(?P<longername2>e)/D
+    abde
+    acde 
+
+/(?:a(?P<c>c(?P<d>d)))(?P<a>a)/D
+
+/(?P<a>a)...(?P=a)bbb(?P>a)d/D
+
+/^\W*(?:(?P<one>(?P<two>.)\W*(?P>one)\W*(?P=two)|)|(?P<three>(?P<four>.)\W*(?P>three)\W*(?P=four)|\W*.\W*))\W*$/i
+    1221
+    Satan, oscillate my metallic sonatas!
+    A man, a plan, a canal: Panama!
+    Able was I ere I saw Elba. 
+    *** Failers
+    The quick brown fox  
+    
+/((?(R)a|b))\1(?1)?/
+  bb
+  bbaa 
+
+/(.*)a/sI
+
+/(.*)a\1/sI
+
+/(.*)a(b)\2/sI
+
+/((.*)a|(.*)b)z/sI
+
+/((.*)a|(.*)b)z\1/sI
+
+/((.*)a|(.*)b)z\2/sI
+
+/((.*)a|(.*)b)z\3/sI
+
+/((.*)a|^(.*)b)z\3/sI
+
+/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a/sI
+
+/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\31/sI
+
+/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\32/sI
+
+/(a)(bc)/ND
+  abc
+
+/(?P<one>a)(bc)/ND
+  abc
+
+/(a)(?P<named>bc)/ND
+
+/(a+)*zz/
+  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazzbbbbbb\M
+  aaaaaaaaaaaaaz\M
+
+/(aaa(?C1)bbb|ab)/
+   aaabbb
+   aaabbb\C*0
+   aaabbb\C*1
+   aaabbb\C*-1
+
+/ab(?P<one>cd)ef(?P<two>gh)/
+    abcdefgh
+    abcdefgh\C1\Gtwo
+    abcdefgh\Cone\Ctwo
+    abcdefgh\Cthree  
+
+/(?P<Tes>)(?P<Test>)/D
+
+/(?P<Test>)(?P<Tes>)/D
+
+/(?P<Z>zz)(?P<A>aa)/
+    zzaa\CZ
+    zzaa\CA
+
 / End of testinput2 /
diff --git a/testdata/testinput3 b/testdata/testinput3
index d3bd74f..391aa62 100644
--- a/testdata/testinput3
+++ b/testdata/testinput3
@@ -1,1724 +1,65 @@
-/(?<!bar)foo/
-    foo
-    catfood
-    arfootle
-    rfoosh
+/^[\w]+/
     *** Failers
-    barfoo
-    towbarfoo
+    École
 
-/\w{3}(?<!bar)foo/
-    catfood
-    *** Failers
-    foo
-    barfoo
-    towbarfoo
-
-/(?<=(foo)a)bar/
-    fooabar
-    *** Failers
-    bar
-    foobbar
-      
-/\Aabc\z/m
-    abc
-    *** Failers
-    abc\n   
-    qqq\nabc
-    abc\nzzz
-    qqq\nabc\nzzz
-
-"(?>.*/)foo"
-    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/it/you/see/
-
-"(?>.*/)foo"
-    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
-
-/(?>(\.\d\d[1-9]?))\d+/
-    1.230003938
-    1.875000282
-    *** Failers 
-    1.235 
-
-/^((?>\w+)|(?>\s+))*$/
-    now is the time for all good men to come to the aid of the party
-    *** Failers
-    this is not a line with only words and spaces!
-    
-/(\d+)(\w)/
-    12345a
-    12345+ 
-
-/((?>\d+))(\w)/
-    12345a
-    *** Failers
-    12345+ 
-
-/(?>a+)b/
-    aaab
-
-/((?>a+)b)/
-    aaab
-
-/(?>(a+))b/
-    aaab
-
-/(?>b)+/
-    aaabbbccc
-
-/(?>a+|b+|c+)*c/
-    aaabbbbccccd
-
-/((?>[^()]+)|\([^()]*\))+/
-    ((abc(ade)ufh()()x
-    
-/\(((?>[^()]+)|\([^()]+\))+\)/ 
-    (abc)
-    (abc(def)xyz)
-    *** Failers
-    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
-
-/a(?-i)b/i
-    ab
-    *** Failers 
-    Ab
-    aB
-    AB
-        
-/(a (?x)b c)d e/
-    a bcd e
-    *** Failers
-    a b cd e
-    abcd e   
-    a bcde 
- 
-/(a b(?x)c d (?-x)e f)/
-    a bcde f
-    *** Failers
-    abcdef  
-
-/(a(?i)b)c/
-    abc
-    aBc
-    *** Failers
-    abC
-    aBC  
-    Abc
-    ABc
-    ABC
-    AbC
-    
-/a(?i:b)c/
-    abc
-    aBc
-    *** Failers 
-    ABC
-    abC
-    aBC
-    
-/a(?i:b)*c/
-    aBc
-    aBBc
-    *** Failers 
-    aBC
-    aBBC
-    
-/a(?=b(?i)c)\w\wd/
-    abcd
-    abCd
-    *** Failers
-    aBCd
-    abcD     
-    
-/(?s-i:more.*than).*million/i
-    more than million
-    more than MILLION
-    more \n than Million 
-    *** Failers
-    MORE THAN MILLION    
-    more \n than \n million 
-
-/(?:(?s-i)more.*than).*million/i
-    more than million
-    more than MILLION
-    more \n than Million 
-    *** Failers
-    MORE THAN MILLION    
-    more \n than \n million 
-    
-/(?>a(?i)b+)+c/ 
-    abc
-    aBbc
-    aBBc 
-    *** Failers
-    Abc
-    abAb    
-    abbC 
-    
-/(?=a(?i)b)\w\wc/
-    abc
-    aBc
-    *** Failers
-    Ab 
-    abC
-    aBC     
-    
-/(?<=a(?i)b)(\w\w)c/
-    abxxc
-    aBxxc
-    *** Failers
-    Abxxc
-    ABxxc
-    abxxC      
-
-/(?:(a)|b)(?(1)A|B)/
-    aA
-    bB
-    *** Failers
-    aB
-    bA    
-
-/^(a)?(?(1)a|b)+$/
-    aa
-    b
-    bb  
-    *** Failers
-    ab   
-
-/^(?(?=abc)\w{3}:|\d\d)$/
-    abc:
-    12
-    *** Failers
-    123
-    xyz    
-
-/^(?(?!abc)\d\d|\w{3}:)$/
-    abc:
-    12
-    *** Failers
-    123
-    xyz    
-    
-/(?(?<=foo)bar|cat)/
-    foobar
-    cat
-    fcat
-    focat   
-    *** Failers
-    foocat  
+/^[\w]+/Lfr
+    École
 
-/(?(?<!foo)cat|bar)/
-    foobar
-    cat
-    fcat
-    focat   
+/^[\w]+/
     *** Failers
-    foocat  
+    École
 
-/( \( )? [^()]+ (?(1) \) |) /x
-    abcd
-    (abcd)
-    the quick (abcd) fox
-    (abcd   
+/^[\W]+/
+    École
 
-/( \( )? [^()]+ (?(1) \) ) /x
-    abcd
-    (abcd)
-    the quick (abcd) fox
-    (abcd   
-
-/^(?(2)a|(1)(2))+$/
-    12
-    12a
-    12aa
+/^[\W]+/Lfr
     *** Failers
-    1234    
+    École
 
-/((?i)blah)\s+\1/
-    blah blah
-    BLAH BLAH
-    Blah Blah
-    blaH blaH
+/[\b]/
+    \b
     *** Failers
-    blah BLAH
-    Blah blah      
-    blaH blah 
-
-/((?i)blah)\s+(?i:\1)/
-    blah blah
-    BLAH BLAH
-    Blah Blah
-    blaH blaH
-    blah BLAH
-    Blah blah      
-    blaH blah 
-
-/(?>a*)*/
     a
-    aa
-    aaaa
-    
-/(abc|)+/
-    abc
-    abcabc
-    abcabcabc
-    xyz      
-
-/([a]*)*/
-    a
-    aaaaa 
- 
-/([ab]*)*/
-    a
-    b
-    ababab
-    aaaabcde
-    bbbb    
- 
-/([^a]*)*/
-    b
-    bbbb
-    aaa   
- 
-/([^ab]*)*/
-    cccc
-    abab  
- 
-/([a]*?)*/
-    a
-    aaaa 
- 
-/([ab]*?)*/
-    a
-    b
-    abab
-    baba   
- 
-/([^a]*?)*/
-    b
-    bbbb
-    aaa   
- 
-/([^ab]*?)*/
-    c
-    cccc
-    baba   
- 
-/(?>a*)*/
-    a
-    aaabcde 
- 
-/((?>a*))*/
-    aaaaa
-    aabbaa 
- 
-/((?>a*?))*/
-    aaaaa
-    aabbaa 
-
-/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /x
-    12-sep-98
-    12-09-98
-    *** Failers
-    sep-12-98
-        
-/(?<=(foo))bar\1/
-    foobarfoo
-    foobarfootling 
-    *** Failers
-    foobar
-    barfoo   
-
-/(?i:saturday|sunday)/
-    saturday
-    sunday
-    Saturday
-    Sunday
-    SATURDAY
-    SUNDAY
-    SunDay
-    
-/(a(?i)bc|BB)x/
-    abcx
-    aBCx
-    bbx
-    BBx
-    *** Failers
-    abcX
-    aBCX
-    bbX
-    BBX               
-
-/^([ab](?i)[cd]|[ef])/
-    ac
-    aC
-    bD
-    elephant
-    Europe 
-    frog
-    France
-    *** Failers
-    Africa     
-
-/^(ab|a(?i)[b-c](?m-i)d|x(?i)y|z)/
-    ab
-    aBd
-    xy
-    xY
-    zebra
-    Zambesi
-    *** Failers
-    aCD  
-    XY  
-
-/(?<=foo\n)^bar/m
-    foo\nbar
-    *** Failers
-    bar
-    baz\nbar   
 
-/(?<=(?<!foo)bar)baz/
-    barbaz
-    barbarbaz 
-    koobarbaz 
+/[\b]/Lfr
+    \b
     *** Failers
-    baz
-    foobarbaz 
-
-/The case of aaaaaa is missed out below because I think Perl 5.005_02 gets/
-/it wrong; it sets $1 to aaa rather than aa. Compare the following test,/
-/where it does set $1 to aa when matching aaaaaa./
-
-/^(a\1?){4}$/
-    a
-    aa
-    aaa
-    aaaa
-    aaaaa
-    aaaaaaa
-    aaaaaaaa
-    aaaaaaaaa
-    aaaaaaaaaa
-    aaaaaaaaaaa
-    aaaaaaaaaaaa
-    aaaaaaaaaaaaa
-    aaaaaaaaaaaaaa
-    aaaaaaaaaaaaaaa
-    aaaaaaaaaaaaaaaa               
-
-/^(a\1?)(a\1?)(a\2?)(a\3?)$/
     a
-    aa
-    aaa
-    aaaa
-    aaaaa
-    aaaaaa
-    aaaaaaa
-    aaaaaaaa
-    aaaaaaaaa
-    aaaaaaaaaa
-    aaaaaaaaaaa
-    aaaaaaaaaaaa
-    aaaaaaaaaaaaa
-    aaaaaaaaaaaaaa
-    aaaaaaaaaaaaaaa
-    aaaaaaaaaaaaaaaa               
-
-/The following tests are taken from the Perl 5.005 test suite; some of them/
-/are compatible with 5.004, but I'd rather not have to sort them out./
-
-/abc/
-    abc
-    xabcy
-    ababc
-    *** Failers
-    xbc
-    axc
-    abx
-
-/ab*c/
-    abc
-
-/ab*bc/
-    abc
-    abbc
-    abbbbc
-
-/.{1}/
-    abbbbc
-
-/.{3,4}/
-    abbbbc
-
-/ab{0,}bc/
-    abbbbc
-
-/ab+bc/
-    abbc
-    *** Failers
-    abc
-    abq
-
-/ab{1,}bc/
-
-/ab+bc/
-    abbbbc
-
-/ab{1,}bc/
-    abbbbc
-
-/ab{1,3}bc/
-    abbbbc
-
-/ab{3,4}bc/
-    abbbbc
-
-/ab{4,5}bc/
-    *** Failers
-    abq
-    abbbbc
-
-/ab?bc/
-    abbc
-    abc
-
-/ab{0,1}bc/
-    abc
-
-/ab?bc/
-
-/ab?c/
-    abc
-
-/ab{0,1}c/
-    abc
-
-/^abc$/
-    abc
-    *** Failers
-    abbbbc
-    abcc
-
-/^abc/
-    abcc
-
-/^abc$/
 
-/abc$/
-    aabc
+/^\w+/
     *** Failers
-    aabc
-    aabcd
+    École
 
-/^/
-    abc
+/^\w+/Lfr
+    École
 
-/$/
-    abc
+/(.+)\b(.+)/
+    École
 
-/a.c/
-    abc
-    axc
-
-/a.*c/
-    axyzc
-
-/a[bc]d/
-    abd
-    *** Failers
-    axyzd
-    abc
-
-/a[b-d]e/
-    ace
-
-/a[b-d]/
-    aac
-
-/a[-b]/
-    a-
-
-/a[b-]/
-    a-
-
-/a]/
-    a]
-
-/a[]]b/
-    a]b
-
-/a[^bc]d/
-    aed
-    *** Failers
-    abd
-    abd
-
-/a[^-b]c/
-    adc
-
-/a[^]b]c/
-    adc
-    *** Failers
-    a-c
-    a]c
-
-/\ba\b/
-    a-
-    -a
-    -a-
-
-/\by\b/
+/(.+)\b(.+)/Lfr
     *** Failers
-    xy
-    yz
-    xyz
+    École
 
-/\Ba\B/
+/École/i
+    École
     *** Failers
-    a-
-    -a
-    -a-
+    école
 
-/\By\b/
-    xy
+/École/iLfr
+    École
+    école
 
-/\by\B/
-    yz
+/\w/IS
 
-/\By\B/
-    xyz
+/\w/ISLfr
 
-/\w/
-    a
-
-/\W/
-    -
-    *** Failers
-    -
-    a
-
-/a\sb/
-    a b
-
-/a\Sb/
-    a-b
-    *** Failers
-    a-b
-    a b
-
-/\d/
-    1
-
-/\D/
-    -
-    *** Failers
-    -
-    1
-
-/[\w]/
-    a
-
-/[\W]/
-    -
-    *** Failers
-    -
-    a
-
-/a[\s]b/
-    a b
-
-/a[\S]b/
-    a-b
-    *** Failers
-    a-b
-    a b
-
-/[\d]/
-    1
-
-/[\D]/
-    -
-    *** Failers
-    -
-    1
-
-/ab|cd/
-    abc
-    abcd
-
-/()ef/
-    def
-
-/$b/
-
-/a\(b/
-    a(b
-
-/a\(*b/
-    ab
-    a((b
-
-/a\\b/
-    a\b
-
-/((a))/
-    abc
-
-/(a)b(c)/
-    abc
-
-/a+b+c/
-    aabbabc
-
-/a{1,}b{1,}c/
-    aabbabc
-
-/a.+?c/
-    abcabc
-
-/(a+|b)*/
-    ab
-
-/(a+|b){0,}/
-    ab
-
-/(a+|b)+/
-    ab
-
-/(a+|b){1,}/
-    ab
-
-/(a+|b)?/
-    ab
-
-/(a+|b){0,1}/
-    ab
-
-/[^ab]*/
-    cde
-
-/abc/
-    *** Failers
-    b
-    
-
-/a*/
-    
-
-/([abc])*d/
-    abbbcd
-
-/([abc])*bcd/
-    abcd
-
-/a|b|c|d|e/
-    e
-
-/(a|b|c|d|e)f/
-    ef
-
-/abcd*efg/
-    abcdefg
-
-/ab*/
-    xabyabbbz
-    xayabbbz
-
-/(ab|cd)e/
-    abcde
-
-/[abhgefdc]ij/
-    hij
-
-/^(ab|cd)e/
-
-/(abc|)ef/
-    abcdef
-
-/(a|b)c*d/
-    abcd
-
-/(ab|ab*)bc/
-    abc
-
-/a([bc]*)c*/
-    abc
-
-/a([bc]*)(c*d)/
-    abcd
-
-/a([bc]+)(c*d)/
-    abcd
-
-/a([bc]*)(c+d)/
-    abcd
-
-/a[bcd]*dcdcde/
-    adcdcde
-
-/a[bcd]+dcdcde/
-    *** Failers
-    abcde
-    adcdcde
-
-/(ab|a)b*c/
-    abc
-
-/((a)(b)c)(d)/
-    abcd
-
-/[a-zA-Z_][a-zA-Z0-9_]*/
-    alpha
-
-/^a(bc+|b[eh])g|.h$/
-    abh
-
-/(bc+d$|ef*g.|h?i(j|k))/
-    effgz
-    ij
-    reffgz
-    *** Failers
-    effg
-    bcdd
-
-/((((((((((a))))))))))/
-    a
-
-/((((((((((a))))))))))\10/
-    aa
-
-/(((((((((a)))))))))/
-    a
-
-/multiple words of text/
-    *** Failers
-    aa
-    uh-uh
-
-/multiple words/
-    multiple words, yeah
-
-/(.*)c(.*)/
-    abcde
-
-/\((.*), (.*)\)/
-    (a, b)
-
-/[k]/
-
-/abcd/
-    abcd
-
-/a(bc)d/
-    abcd
-
-/a[-]?c/
-    ac
-
-/(abc)\1/
-    abcabc
-
-/([a-c]*)\1/
-    abcabc
-
-/(a)|\1/
-    a
-    *** Failers
-    ab
-    x
-
-/(([a-c])b*?\2)*/
-    ababbbcbc
-
-/(([a-c])b*?\2){3}/
-    ababbbcbc
-
-/((\3|b)\2(a)x)+/
-    aaaxabaxbaaxbbax
-
-/((\3|b)\2(a)){2,}/
-    bbaababbabaaaaabbaaaabba
-
-/abc/i
-    ABC
-    XABCY
-    ABABC
-    *** Failers
-    aaxabxbaxbbx
-    XBC
-    AXC
-    ABX
-
-/ab*c/i
-    ABC
-
-/ab*bc/i
-    ABC
-    ABBC
-
-/ab*?bc/i
-    ABBBBC
-
-/ab{0,}?bc/i
-    ABBBBC
-
-/ab+?bc/i
-    ABBC
-
-/ab+bc/i
-    *** Failers
-    ABC
-    ABQ
-
-/ab{1,}bc/i
-
-/ab+bc/i
-    ABBBBC
-
-/ab{1,}?bc/i
-    ABBBBC
-
-/ab{1,3}?bc/i
-    ABBBBC
-
-/ab{3,4}?bc/i
-    ABBBBC
-
-/ab{4,5}?bc/i
-    *** Failers
-    ABQ
-    ABBBBC
-
-/ab??bc/i
-    ABBC
-    ABC
-
-/ab{0,1}?bc/i
-    ABC
-
-/ab??bc/i
-
-/ab??c/i
-    ABC
-
-/ab{0,1}?c/i
-    ABC
-
-/^abc$/i
-    ABC
-    *** Failers
-    ABBBBC
-    ABCC
-
-/^abc/i
-    ABCC
-
-/^abc$/i
-
-/abc$/i
-    AABC
-
-/^/i
-    ABC
-
-/$/i
-    ABC
-
-/a.c/i
-    ABC
-    AXC
-
-/a.*?c/i
-    AXYZC
-
-/a.*c/i
-    *** Failers
-    AABC
-    AXYZD
-
-/a[bc]d/i
-    ABD
-
-/a[b-d]e/i
-    ACE
-    *** Failers
-    ABC
-    ABD
-
-/a[b-d]/i
-    AAC
-
-/a[-b]/i
-    A-
-
-/a[b-]/i
-    A-
-
-/a]/i
-    A]
-
-/a[]]b/i
-    A]B
-
-/a[^bc]d/i
-    AED
-
-/a[^-b]c/i
-    ADC
-    *** Failers
-    ABD
-    A-C
-
-/a[^]b]c/i
-    ADC
-
-/ab|cd/i
-    ABC
-    ABCD
-
-/()ef/i
-    DEF
-
-/$b/i
-    *** Failers
-    A]C
-    B
+/^[\xc8-\xc9]/iLfr
+    École
+    école
 
-/a\(b/i
-    A(B
-
-/a\(*b/i
-    AB
-    A((B
-
-/a\\b/i
-    A\B
-
-/((a))/i
-    ABC
-
-/(a)b(c)/i
-    ABC
-
-/a+b+c/i
-    AABBABC
-
-/a{1,}b{1,}c/i
-    AABBABC
-
-/a.+?c/i
-    ABCABC
-
-/a.*?c/i
-    ABCABC
-
-/a.{0,5}?c/i
-    ABCABC
-
-/(a+|b)*/i
-    AB
-
-/(a+|b){0,}/i
-    AB
-
-/(a+|b)+/i
-    AB
-
-/(a+|b){1,}/i
-    AB
-
-/(a+|b)?/i
-    AB
-
-/(a+|b){0,1}/i
-    AB
-
-/(a+|b){0,1}?/i
-    AB
-
-/[^ab]*/i
-    CDE
-
-/abc/i
-
-/a*/i
-    
-
-/([abc])*d/i
-    ABBBCD
-
-/([abc])*bcd/i
-    ABCD
-
-/a|b|c|d|e/i
-    E
-
-/(a|b|c|d|e)f/i
-    EF
-
-/abcd*efg/i
-    ABCDEFG
-
-/ab*/i
-    XABYABBBZ
-    XAYABBBZ
-
-/(ab|cd)e/i
-    ABCDE
-
-/[abhgefdc]ij/i
-    HIJ
-
-/^(ab|cd)e/i
-    ABCDE
-
-/(abc|)ef/i
-    ABCDEF
-
-/(a|b)c*d/i
-    ABCD
-
-/(ab|ab*)bc/i
-    ABC
-
-/a([bc]*)c*/i
-    ABC
-
-/a([bc]*)(c*d)/i
-    ABCD
-
-/a([bc]+)(c*d)/i
-    ABCD
-
-/a([bc]*)(c+d)/i
-    ABCD
-
-/a[bcd]*dcdcde/i
-    ADCDCDE
-
-/a[bcd]+dcdcde/i
-
-/(ab|a)b*c/i
-    ABC
-
-/((a)(b)c)(d)/i
-    ABCD
-
-/[a-zA-Z_][a-zA-Z0-9_]*/i
-    ALPHA
-
-/^a(bc+|b[eh])g|.h$/i
-    ABH
-
-/(bc+d$|ef*g.|h?i(j|k))/i
-    EFFGZ
-    IJ
-    REFFGZ
-    *** Failers
-    ADCDCDE
-    EFFG
-    BCDD
-
-/((((((((((a))))))))))/i
-    A
-
-/((((((((((a))))))))))\10/i
-    AA
-
-/(((((((((a)))))))))/i
-    A
-
-/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/i
-    A
-
-/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/i
-    C
-
-/multiple words of text/i
-    *** Failers
-    AA
-    UH-UH
-
-/multiple words/i
-    MULTIPLE WORDS, YEAH
-
-/(.*)c(.*)/i
-    ABCDE
-
-/\((.*), (.*)\)/i
-    (A, B)
-
-/[k]/i
-
-/abcd/i
-    ABCD
-
-/a(bc)d/i
-    ABCD
-
-/a[-]?c/i
-    AC
-
-/(abc)\1/i
-    ABCABC
-
-/([a-c]*)\1/i
-    ABCABC
-
-/a(?!b)./
-    abad
-
-/a(?=d)./
-    abad
-
-/a(?=c|d)./
-    abad
-
-/a(?:b|c|d)(.)/
-    ace
-
-/a(?:b|c|d)*(.)/
-    ace
-
-/a(?:b|c|d)+?(.)/
-    ace
-    acdbcdbe
-
-/a(?:b|c|d)+(.)/
-    acdbcdbe
-
-/a(?:b|c|d){2}(.)/
-    acdbcdbe
-
-/a(?:b|c|d){4,5}(.)/
-    acdbcdbe
-
-/a(?:b|c|d){4,5}?(.)/
-    acdbcdbe
-
-/((foo)|(bar))*/
-    foobar
-
-/a(?:b|c|d){6,7}(.)/
-    acdbcdbe
-
-/a(?:b|c|d){6,7}?(.)/
-    acdbcdbe
-
-/a(?:b|c|d){5,6}(.)/
-    acdbcdbe
-
-/a(?:b|c|d){5,6}?(.)/
-    acdbcdbe
-
-/a(?:b|c|d){5,7}(.)/
-    acdbcdbe
-
-/a(?:b|c|d){5,7}?(.)/
-    acdbcdbe
-
-/a(?:b|(c|e){1,2}?|d)+?(.)/
-    ace
-
-/^(.+)?B/
-    AB
-
-/^([^a-z])|(\^)$/
-    .
-
-/^[<>]&/
-    <&OUT
-
-/^(a\1?){4}$/
-    aaaaaaaaaa
-    *** Failers
-    AB
-    aaaaaaaaa
-    aaaaaaaaaaa
-
-/^(a(?(1)\1)){4}$/
-    aaaaaaaaaa
-    *** Failers
-    aaaaaaaaa
-    aaaaaaaaaaa
-
-/(?:(f)(o)(o)|(b)(a)(r))*/
-    foobar
-
-/(?<=a)b/
-    ab
-    *** Failers
-    cb
-    b
-
-/(?<!c)b/
-    ab
-    b
-    b
-
-/(?:..)*a/
-    aba
-
-/(?:..)*?a/
-    aba
-
-/^(?:b|a(?=(.)))*\1/
-    abc
-
-/^(){3,5}/
-    abc
-
-/^(a+)*ax/
-    aax
-
-/^((a|b)+)*ax/
-    aax
-
-/^((a|bc)+)*ax/
-    aax
-
-/(a|x)*ab/
-    cab
-
-/(a)*ab/
-    cab
-
-/(?:(?i)a)b/
-    ab
-
-/((?i)a)b/
-    ab
-
-/(?:(?i)a)b/
-    Ab
-
-/((?i)a)b/
-    Ab
-
-/(?:(?i)a)b/
-    *** Failers
-    cb
-    aB
-
-/((?i)a)b/
-
-/(?i:a)b/
-    ab
-
-/((?i:a))b/
-    ab
-
-/(?i:a)b/
-    Ab
-
-/((?i:a))b/
-    Ab
-
-/(?i:a)b/
-    *** Failers
-    aB
-    aB
-
-/((?i:a))b/
-
-/(?:(?-i)a)b/i
-    ab
-
-/((?-i)a)b/i
-    ab
-
-/(?:(?-i)a)b/i
-    aB
-
-/((?-i)a)b/i
-    aB
-
-/(?:(?-i)a)b/i
-    *** Failers
-    aB
-    Ab
-
-/((?-i)a)b/i
-
-/(?:(?-i)a)b/i
-    aB
-
-/((?-i)a)b/i
-    aB
-
-/(?:(?-i)a)b/i
-    *** Failers
-    Ab
-    AB
-
-/((?-i)a)b/i
-
-/(?-i:a)b/i
-    ab
-
-/((?-i:a))b/i
-    ab
-
-/(?-i:a)b/i
-    aB
-
-/((?-i:a))b/i
-    aB
-
-/(?-i:a)b/i
-    *** Failers
-    AB
-    Ab
-
-/((?-i:a))b/i
-
-/(?-i:a)b/i
-    aB
-
-/((?-i:a))b/i
-    aB
-
-/(?-i:a)b/i
-    *** Failers
-    Ab
-    AB
-
-/((?-i:a))b/i
-
-/((?-i:a.))b/i
-    *** Failers
-    AB
-    a\nB
-
-/((?s-i:a.))b/i
-    a\nB
-
-/(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))/
-    cabbbb
-
-/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/
-    caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
-
-/(ab)\d\1/i
-    Ab4ab
-    ab4Ab
-
-/foo\w*\d{4}baz/
-    foobar1234baz
-
-/x(~~)*(?:(?:F)?)?/
-    x~~
-
-/^a(?#xxx){3}c/
-    aaac
-
-/^a (?#xxx) (?#yyy) {3}c/x
-    aaac
-
-/(?<![cd])b/
-    *** Failers
-    B\nB
-    dbcb
-
-/(?<![cd])[ab]/
-    dbaacb
-
-/(?<!(c|d))b/
-
-/(?<!(c|d))[ab]/
-    dbaacb
-
-/(?<!cd)[ab]/
-    cdaccb
-
-/^(?:a?b?)*$/
-    *** Failers
-    dbcb
-    a--
-
-/((?s)^a(.))((?m)^b$)/
-    a\nb\nc\n
-
-/((?m)^b$)/
-    a\nb\nc\n
-
-/(?m)^b/
-    a\nb\n
-
-/(?m)^(b)/
-    a\nb\n
-
-/((?m)^b)/
-    a\nb\n
-
-/\n((?m)^b)/
-    a\nb\n
-
-/((?s).)c(?!.)/
-    a\nb\nc\n
-    a\nb\nc\n
-
-/((?s)b.)c(?!.)/
-    a\nb\nc\n
-    a\nb\nc\n
-
-/^b/
-
-/()^b/
-    *** Failers
-    a\nb\nc\n
-    a\nb\nc\n
-
-/((?m)^b)/
-    a\nb\nc\n
-
-/(?(1)a|b)/
-
-/(?(1)b|a)/
-    a
-
-/(x)?(?(1)a|b)/
-    *** Failers
-    a
-    a
-
-/(x)?(?(1)b|a)/
-    a
-
-/()?(?(1)b|a)/
-    a
-
-/()(?(1)b|a)/
-
-/()?(?(1)a|b)/
-    a
-
-/^(\()?blah(?(1)(\)))$/
-    (blah)
-    blah
-    *** Failers
-    a
-    blah)
-    (blah
-
-/^(\(+)?blah(?(1)(\)))$/
-    (blah)
-    blah
-    *** Failers
-    blah)
-    (blah
-
-/(?(?!a)a|b)/
-
-/(?(?!a)b|a)/
-    a
-
-/(?(?=a)b|a)/
-    *** Failers
-    a
-    a
-
-/(?(?=a)a|b)/
-    a
-
-/(?=(a+?))(\1ab)/
-    aaab
-
-/^(?=(a+?))\1ab/
-
-/(\w+:)+/
-    one:
-
-/$(?<=^(a))/
-    a
-
-/(?=(a+?))(\1ab)/
-    aaab
-
-/^(?=(a+?))\1ab/
-    *** Failers
-    aaab
-    aaab
-
-/([\w:]+::)?(\w+)$/
-    abcd
-    xy:z:::abcd
-
-/^[^bcd]*(c+)/
-    aexycd
-
-/(a*)b+/
-    caab
-
-/([\w:]+::)?(\w+)$/
-    abcd
-    xy:z:::abcd
-    *** Failers
-    abcd:
-    abcd:
-
-/^[^bcd]*(c+)/
-    aexycd
-
-/(>a+)ab/
-
-/(?>a+)b/
-    aaab
-
-/([[:]+)/
-    a:[b]:
-
-/([[=]+)/
-    a=[b]=
-
-/([[.]+)/
-    a.[b].
-
-/((?>a+)b)/
-    aaab
-
-/(?>(a+))b/
-    aaab
-
-/((?>[^()]+)|\([^()]*\))+/
-    ((abc(ade)ufh()()x
-
-/a\Z/
-    *** Failers
-    aaab
-    a\nb\n
-
-/b\Z/
-    a\nb\n
-
-/b\z/
-
-/b\Z/
-    a\nb
-
-/b\z/
-    a\nb
-    *** Failers
-    
-/^(?>(?(1)\.|())[^\W_](?>[a-z0-9-]*[^\W_])?)+$/
-    a
-    abc
-    a-b
-    0-9 
-    a.b
-    5.6.7  
-    the.quick.brown.fox
-    a100.b200.300c  
-    12-ab.1245 
-    ***Failers
-    \
-    .a
-    -a
-    a-
-    a.  
-    a_b 
-    a.-
-    a..  
-    ab..bc 
-    the.quick.brown.fox-
-    the.quick.brown.fox.
-    the.quick.brown.fox_
-    the.quick.brown.fox+       
-
-/(?>.*)(?<=(abcd|wxyz))/
-    alphabetabcd
-    endingwxyz
-    *** Failers
-    a rather long string that doesn't end with one of them
-
-/word (?>(?:(?!otherword)[a-zA-Z0-9]+ ){0,30})otherword/
-    word cat dog elephant mussel cow horse canary baboon snake shark otherword
-    word cat dog elephant mussel cow horse canary baboon snake shark
-  
-/word (?>[a-zA-Z0-9]+ ){0,30}otherword/
-    word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope
-
-/(?<=\d{3}(?!999))foo/
-    999foo
-    123999foo 
-    *** Failers
-    123abcfoo
-    
-/(?<=(?!...999)\d{3})foo/
-    999foo
-    123999foo 
-    *** Failers
-    123abcfoo
-
-/(?<=\d{3}(?!999)...)foo/
-    123abcfoo
-    123456foo 
-    *** Failers
-    123999foo  
-    
-/(?<=\d{3}...)(?<!999)foo/
-    123abcfoo   
-    123456foo 
-    *** Failers
-    123999foo  
-
-/<a[\s]+href[\s]*=[\s]*          # find <a href=
- ([\"\'])?                       # find single or double quote
- (?(1) (.*?)\1 | ([^\s]+))       # if quote found, match up to next matching
-                                 # quote, otherwise match up to next space
-/isx
-    <a href=abcd xyz
-    <a href=\"abcd xyz pqr\" cats
-    <a href=\'abcd xyz pqr\' cats
-
-/<a\s+href\s*=\s*                # find <a href=
- (["'])?                         # find single or double quote
- (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
-                                 # quote, otherwise match up to next space
-/isx
-    <a href=abcd xyz
-    <a href=\"abcd xyz pqr\" cats
-    <a href       =       \'abcd xyz pqr\' cats
-
-/<a\s+href(?>\s*)=(?>\s*)        # find <a href=
- (["'])?                         # find single or double quote
- (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
-                                 # quote, otherwise match up to next space
-/isx
-    <a href=abcd xyz
-    <a href=\"abcd xyz pqr\" cats
-    <a href       =       \'abcd xyz pqr\' cats
-
-/((Z)+|A)*/
-    ZABCDEFG
-
-/(Z()|A)*/
-    ZABCDEFG
-
-/(Z(())|A)*/
-    ZABCDEFG
-
-/((?>Z)+|A)*/
-    ZABCDEFG
-
-/((?>)+|A)*/
-    ZABCDEFG
-
-/a*/g
-    abbab
-
-/^[a-\d]/
-    abcde
-    -things
-    0digit
-    *** Failers
-    bcdef    
-
-/^[\d-a]/
-    abcde
-    -things
-    0digit
-    *** Failers
-    bcdef    
+/^[\xc8-\xc9]/Lfr
+    École
+    *** Failers 
+    école
 
-/ End of testinput3 /       
+/ End of testinput3 /
diff --git a/testdata/testinput4 b/testdata/testinput4
index f287896..540660f 100644
--- a/testdata/testinput4
+++ b/testdata/testinput4
@@ -1,65 +1,485 @@
-/^[\w]+/
+/-- Do not use the \x{} construct except with patterns that have the --/
+/-- /8 option set, because PCRE doesn't recognize them as UTF-8 unless --/
+/-- that option is set. However, the latest Perls recognize them always. --/
+
+/a.b/8
+    acb
+    a\x7fb
+    a\x{100}b 
+    *** Failers
+    a\nb  
+
+/a(.{3})b/8
+    a\x{4000}xyb 
+    a\x{4000}\x7fyb 
+    a\x{4000}\x{100}yb 
+    *** Failers
+    a\x{4000}b 
+    ac\ncb 
+
+/a(.*?)(.)/
+    a\xc0\x88b
+
+/a(.*?)(.)/8
+    a\x{100}b
+
+/a(.*)(.)/
+    a\xc0\x88b
+
+/a(.*)(.)/8
+    a\x{100}b
+
+/a(.)(.)/
+    a\xc0\x92bcd
+
+/a(.)(.)/8
+    a\x{240}bcd
+
+/a(.?)(.)/
+    a\xc0\x92bcd
+
+/a(.?)(.)/8
+    a\x{240}bcd
+
+/a(.??)(.)/
+    a\xc0\x92bcd
+
+/a(.??)(.)/8
+    a\x{240}bcd
+
+/a(.{3})b/8
+    a\x{1234}xyb 
+    a\x{1234}\x{4321}yb 
+    a\x{1234}\x{4321}\x{3412}b 
+    *** Failers
+    a\x{1234}b 
+    ac\ncb 
+
+/a(.{3,})b/8
+    a\x{1234}xyb 
+    a\x{1234}\x{4321}yb 
+    a\x{1234}\x{4321}\x{3412}b 
+    axxxxbcdefghijb 
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+    *** Failers
+    a\x{1234}b 
+
+/a(.{3,}?)b/8
+    a\x{1234}xyb 
+    a\x{1234}\x{4321}yb 
+    a\x{1234}\x{4321}\x{3412}b 
+    axxxxbcdefghijb 
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+    *** Failers
+    a\x{1234}b 
+
+/a(.{3,5})b/8
+    a\x{1234}xyb 
+    a\x{1234}\x{4321}yb 
+    a\x{1234}\x{4321}\x{3412}b 
+    axxxxbcdefghijb 
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+    axbxxbcdefghijb 
+    axxxxxbcdefghijb 
+    *** Failers
+    a\x{1234}b 
+    axxxxxxbcdefghijb 
+
+/a(.{3,5}?)b/8
+    a\x{1234}xyb 
+    a\x{1234}\x{4321}yb 
+    a\x{1234}\x{4321}\x{3412}b 
+    axxxxbcdefghijb 
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+    axbxxbcdefghijb 
+    axxxxxbcdefghijb 
+    *** Failers
+    a\x{1234}b 
+    axxxxxxbcdefghijb 
+
+/^[a\x{c0}]/8
+    *** Failers
+    \x{100}
+
+/(?<=aXb)cd/8
+    aXbcd
+
+/(?<=a\x{100}b)cd/8
+    a\x{100}bcd
+
+/(?<=a\x{100000}b)cd/8
+    a\x{100000}bcd
+    
+/(?:\x{100}){3}b/8
+    \x{100}\x{100}\x{100}b
+    *** Failers 
+    \x{100}\x{100}b
+
+/\x{ab}/8
+    \x{ab} 
+    \xc2\xab
+    *** Failers 
+    \x00{ab}
+
+/(?<=(.))X/8
+    WXYZ
+    \x{256}XYZ 
+    *** Failers
+    XYZ 
+
+/X(\C{3})/8
+    X\x{1234}
+
+/X(\C{4})/8
+    X\x{1234}YZ
+    
+/X\C*/8
+    XYZabcdce
+    
+/X\C*?/8
+    XYZabcde
+    
+/X\C{3,5}/8
+    Xabcdefg   
+    X\x{1234} 
+    X\x{1234}YZ
+    X\x{1234}\x{512}  
+    X\x{1234}\x{512}YZ
+
+/X\C{3,5}?/8
+    Xabcdefg   
+    X\x{1234} 
+    X\x{1234}YZ
+    X\x{1234}\x{512}  
+
+/[^a]+/8g
+    bcd
+    \x{100}aY\x{256}Z 
+    
+/^[^a]{2}/8
+    \x{100}bc
+ 
+/^[^a]{2,}/8
+    \x{100}bcAa
+
+/^[^a]{2,}?/8
+    \x{100}bca
+
+/[^a]+/8ig
+    bcd
+    \x{100}aY\x{256}Z 
+    
+/^[^a]{2}/8i
+    \x{100}bc
+ 
+/^[^a]{2,}/8i
+    \x{100}bcAa
+
+/^[^a]{2,}?/8i
+    \x{100}bca
+
+/\x{100}{0,0}/8
+    abcd
+ 
+/\x{100}?/8
+    abcd
+    \x{100}\x{100} 
+
+/\x{100}{0,3}/8 
+    \x{100}\x{100} 
+    \x{100}\x{100}\x{100}\x{100} 
+    
+/\x{100}*/8
+    abce
+    \x{100}\x{100}\x{100}\x{100} 
+
+/\x{100}{1,1}/8
+    abcd\x{100}\x{100}\x{100}\x{100} 
+
+/\x{100}{1,3}/8
+    abcd\x{100}\x{100}\x{100}\x{100} 
+
+/\x{100}+/8
+    abcd\x{100}\x{100}\x{100}\x{100} 
+
+/\x{100}{3}/8
+    abcd\x{100}\x{100}\x{100}XX
+
+/\x{100}{3,5}/8
+    abcd\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}XX
+
+/\x{100}{3,}/8
+    abcd\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}XX
+
+/(?<=a\x{100}{2}b)X/8+
+    Xyyya\x{100}\x{100}bXzzz
+
+/\D*/8
+  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+
+/\D*/8
+  \x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}
+
+/\D/8
+    1X2
+    1\x{100}2 
+  
+/>\S/8
+    > >X Y
+    > >\x{100} Y
+  
+/\W/8
+    A.B
+    A\x{100}B 
+  
+/\d/8
+    \x{100}3
+    
+/\s/8
+    \x{100} X
+    
+/\w/8
+    \x{100}X   
+
+/\D+/8
+    12abcd34
     *** Failers
-    École
+    1234  
 
-/^[\w]+/Lfr
-    École
+/\D{2,3}/8
+    12abcd34
+    12ab34
+    *** Failers  
+    1234
+    12a34  
 
-/^[\w]+/
+/\D{2,3}?/8
+    12abcd34
+    12ab34
+    *** Failers  
+    1234
+    12a34  
+
+/\d+/8
+    12abcd34
     *** Failers
-    École
 
-/^[\W]+/
-    École
+/\d{2,3}/8
+    12abcd34
+    1234abcd
+    *** Failers  
+    1.4 
+
+/\d{2,3}?/8
+    12abcd34
+    1234abcd
+    *** Failers  
+    1.4 
 
-/^[\W]+/Lfr
+/\S+/8
+    12abcd34
     *** Failers
-    École
+    \    \ 
 
-/[\b]/
-    \b
+/\S{2,3}/8
+    12abcd34
+    1234abcd
     *** Failers
-    a
+    \     \  
 
-/[\b]/Lfr
-    \b
+/\S{2,3}?/8
+    12abcd34
+    1234abcd
     *** Failers
-    a
+    \     \  
 
-/^\w+/
+/>\s+</8+
+    12>      <34
     *** Failers
-    École
 
-/^\w+/Lfr
-    École
+/>\s{2,3}</8+
+    ab>  <cd
+    ab>   <ce
+    *** Failers
+    ab>    <cd 
 
-/(.+)\b(.+)/
-    École
+/>\s{2,3}?</8+
+    ab>  <cd
+    ab>   <ce
+    *** Failers
+    ab>    <cd 
 
-/(.+)\b(.+)/Lfr
+/\w+/8
+    12      34
     *** Failers
-    École
+    +++=*! 
 
-/École/i
-    École
+/\w{2,3}/8
+    ab  cd
+    abcd ce
     *** Failers
-    école
+    a.b.c
 
-/École/iLfr
-    École
-    école
+/\w{2,3}?/8
+    ab  cd
+    abcd ce
+    *** Failers
+    a.b.c
 
-/\w/IS
+/\W+/8
+    12====34
+    *** Failers
+    abcd 
 
-/\w/ISLfr
+/\W{2,3}/8
+    ab====cd
+    ab==cd
+    *** Failers
+    a.b.c
 
-/^[\xc8-\xc9]/iLfr
-    École
-    école
+/\W{2,3}?/8
+    ab====cd
+    ab==cd
+    *** Failers
+    a.b.c
 
-/^[\xc8-\xc9]/Lfr
-    École
+/[\x{100}]/8
+    \x{100}
+    Z\x{100}
+    \x{100}Z
     *** Failers 
-    école
+
+/[Z\x{100}]/8
+    Z\x{100}
+    \x{100}
+    \x{100}Z
+    *** Failers 
+
+/[\x{100}\x{200}]/8
+   ab\x{100}cd
+   ab\x{200}cd
+   *** Failers  
+
+/[\x{100}-\x{200}]/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{111}cd 
+   *** Failers  
+
+/[z-\x{200}]/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{111}cd 
+   abzcd
+   ab|cd  
+   *** Failers  
+
+/[Q\x{100}\x{200}]/8
+   ab\x{100}cd
+   ab\x{200}cd
+   Q? 
+   *** Failers  
+
+/[Q\x{100}-\x{200}]/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{111}cd 
+   Q? 
+   *** Failers  
+
+/[Qz-\x{200}]/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{111}cd 
+   abzcd
+   ab|cd  
+   Q? 
+   *** Failers  
+
+/[\x{100}\x{200}]{1,3}/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{200}\x{100}\x{200}\x{100}cd
+   *** Failers  
+
+/[\x{100}\x{200}]{1,3}?/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{200}\x{100}\x{200}\x{100}cd
+   *** Failers  
+
+/[Q\x{100}\x{200}]{1,3}/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{200}\x{100}\x{200}\x{100}cd
+   *** Failers  
+
+/[Q\x{100}\x{200}]{1,3}?/8
+   ab\x{100}cd
+   ab\x{200}cd
+   ab\x{200}\x{100}\x{200}\x{100}cd
+   *** Failers  
+
+/(?<=[\x{100}\x{200}])X/8
+    abc\x{200}X
+    abc\x{100}X 
+    *** Failers
+    X  
+
+/(?<=[Q\x{100}\x{200}])X/8
+    abc\x{200}X
+    abc\x{100}X 
+    abQX 
+    *** Failers
+    X  
+
+/(?<=[\x{100}\x{200}]{3})X/8
+    abc\x{100}\x{200}\x{100}X
+    *** Failers
+    abc\x{200}X
+    X  
+
+/[^\x{100}\x{200}]X/8
+    AX
+    \x{150}X
+    \x{500}X 
+    *** Failers
+    \x{100}X
+    \x{200}X   
+
+/[^Q\x{100}\x{200}]X/8
+    AX
+    \x{150}X
+    \x{500}X 
+    *** Failers
+    \x{100}X
+    \x{200}X   
+    QX 
+
+/[^\x{100}-\x{200}]X/8
+    AX
+    \x{500}X 
+    *** Failers
+    \x{100}X
+    \x{150}X
+    \x{200}X   
+
+/a\Cb/
+    aXb
+    a\nb
+  
+/a\Cb/8
+    aXb
+    a\nb
+    *** Failers 
+    a\x{100}b 
+
+/[z-\x{100}]/8i
+    z
+    Z 
+    \x{100}
+    *** Failers
+    \x{101}
+    y    
 
 / End of testinput4 /
diff --git a/testdata/testinput5 b/testdata/testinput5
index d66cfbd..ec1aa9a 100644
--- a/testdata/testinput5
+++ b/testdata/testinput5
@@ -1,118 +1,185 @@
-/-- Because of problems with Perl 5.6 in handling UTF-8 vs non UTF-8 --/
-/-- strings automatically, do not use the \x{} construct except with --/
-/-- patterns that have the /8 option set, and don't use them without! --/
-
-/a.b/8
-    acb
-    a\x7fb
-    a\x{100}b 
-    *** Failers
-    a\nb  
+/\x{100}/8DM
 
-/a(.{3})b/8
-    a\x{4000}xyb 
-    a\x{4000}\x7fyb 
-    a\x{4000}\x{100}yb 
-    *** Failers
-    a\x{4000}b 
-    ac\ncb 
+/\x{1000}/8DM
 
-/a(.*?)(.)/
-    a\xc0\x88b
+/\x{10000}/8DM
 
-/a(.*?)(.)/8
-    a\x{100}b
+/\x{100000}/8DM
 
-/a(.*)(.)/
-    a\xc0\x88b
+/\x{1000000}/8DM
 
-/a(.*)(.)/8
-    a\x{100}b
+/\x{4000000}/8DM
 
-/a(.)(.)/
-    a\xc0\x92bcd
+/\x{7fffFFFF}/8DM
 
-/a(.)(.)/8
-    a\x{240}bcd
+/[\x{ff}]/8DM
 
-/a(.?)(.)/
-    a\xc0\x92bcd
+/[\x{100}]/8DM
 
-/a(.?)(.)/8
-    a\x{240}bcd
+/\x{ffffffff}/8
 
-/a(.??)(.)/
-    a\xc0\x92bcd
+/\x{100000000}/8
 
-/a(.??)(.)/8
-    a\x{240}bcd
+/^\x{100}a\x{1234}/8
+    \x{100}a\x{1234}bcd
 
-/a(.{3})b/8
-    a\x{1234}xyb 
-    a\x{1234}\x{4321}yb 
-    a\x{1234}\x{4321}\x{3412}b 
-    *** Failers
-    a\x{1234}b 
-    ac\ncb 
-
-/a(.{3,})b/8
-    a\x{1234}xyb 
-    a\x{1234}\x{4321}yb 
-    a\x{1234}\x{4321}\x{3412}b 
-    axxxxbcdefghijb 
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
-    *** Failers
-    a\x{1234}b 
-
-/a(.{3,}?)b/8
-    a\x{1234}xyb 
-    a\x{1234}\x{4321}yb 
-    a\x{1234}\x{4321}\x{3412}b 
-    axxxxbcdefghijb 
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
-    *** Failers
-    a\x{1234}b 
-
-/a(.{3,5})b/8
-    a\x{1234}xyb 
-    a\x{1234}\x{4321}yb 
-    a\x{1234}\x{4321}\x{3412}b 
-    axxxxbcdefghijb 
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
-    axbxxbcdefghijb 
-    axxxxxbcdefghijb 
-    *** Failers
-    a\x{1234}b 
-    axxxxxxbcdefghijb 
-
-/a(.{3,5}?)b/8
-    a\x{1234}xyb 
-    a\x{1234}\x{4321}yb 
-    a\x{1234}\x{4321}\x{3412}b 
-    axxxxbcdefghijb 
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
-    axbxxbcdefghijb 
-    axxxxxbcdefghijb 
-    *** Failers
-    a\x{1234}b 
-    axxxxxxbcdefghijb 
+/\x80/8D
+
+/\xff/8D
+
+/\x{0041}\x{2262}\x{0391}\x{002e}/D8
+    \x{0041}\x{2262}\x{0391}\x{002e}
+    
+/\x{D55c}\x{ad6d}\x{C5B4}/D8 
+    \x{D55c}\x{ad6d}\x{C5B4} 
+
+/\x{65e5}\x{672c}\x{8a9e}/D8
+    \x{65e5}\x{672c}\x{8a9e}
+
+/\x{80}/D8
+
+/\x{084}/D8
+
+/\x{104}/D8
+
+/\x{861}/D8
 
-/^[a\x{c0}]/8
+/\x{212ab}/D8
+
+/.{3,5}X/D8
+    \x{212ab}\x{212ab}\x{212ab}\x{861}X
+
+
+/.{3,5}?/D8
+    \x{212ab}\x{212ab}\x{212ab}\x{861}
+
+/-- These tests are here rather than in testinput4 because Perl 5.6 has --/
+/-- some problems with UTF-8 support, in the area of \x{..} where the   --/
+/-- value is < 255. It grumbles about invalid UTF-8 strings.            --/
+
+/^[a\x{c0}]b/8
+    \x{c0}b
+    
+/^([a\x{c0}]*?)aa/8
+    a\x{c0}aaaa/ 
+
+/^([a\x{c0}]*?)aa/8
+    a\x{c0}aaaa/ 
+    a\x{c0}a\x{c0}aaa/ 
+
+/^([a\x{c0}]*)aa/8
+    a\x{c0}aaaa/ 
+    a\x{c0}a\x{c0}aaa/ 
+
+/^([a\x{c0}]*)a\x{c0}/8
+    a\x{c0}aaaa/ 
+    a\x{c0}a\x{c0}aaa/ 
+    
+/-- --/ 
+    
+/(?<=\C)X/8
+    Should produce an error diagnostic
+    
+/-- This one is here not because it's different to Perl, but because the --/
+/-- way the captured single-byte is displayed. (In Perl it becomes a --/
+/-- character, and you can't tell the difference.) --/
+    
+/X(\C)(.*)/8
+    X\x{1234}
+    X\nabc 
+    
+/^[ab]/8D
+    bar
     *** Failers
+    c
+    \x{ff}
+    \x{100}  
+
+/^[^ab]/8D
+    c
+    \x{ff}
+    \x{100}  
+    *** Failers 
+    aaa
+  
+/[^ab\xC0-\xF0]/8SD
+    \x{f1}
+    \x{bf}
     \x{100}
+    \x{1000}   
+    *** Failers
+    \x{c0} 
+    \x{f0} 
 
-/(?<=aXb)cd/8
-    aXbcd
+/Ä€{3,4}/8SD
+  \x{100}\x{100}\x{100}\x{100\x{100}
 
-/(?<=a\x{100}b)cd/8
-    a\x{100}bcd
+/(\x{100}+|x)/8SD
 
-/(?<=a\x{100000}b)cd/8
-    a\x{100000}bcd
-    
-/(?:\x{100}){3}b/8
-    \x{100}\x{100}\x{100}b
+/(\x{100}*a|x)/8SD
+
+/(\x{100}{0,2}a|x)/8SD
+
+/(\x{100}{1,2}a|x)/8SD
+
+/\x{100}*(\d+|"(?1)")/8
+    1234
+    "1234" 
+    \x{100}1234
+    "\x{100}1234"  
+    \x{100}\x{100}12ab 
+    \x{100}\x{100}"12" 
     *** Failers 
-    \x{100}\x{100}b
+    \x{100}\x{100}abcd
+
+/\x{100}/8D
+
+/\x{100}*/8D
+
+/a\x{100}*/8D
+
+/ab\x{100}*/8D
+
+/a\x{100}\x{101}*/8D
+
+/a\x{100}\x{101}+/8D
+
+/\x{100}*A/8D
+    A
+
+/\x{100}*\d(?R)/8D
+
+/[^\x{c4}]/D
+
+/[^\x{c4}]/8D
+
+/[\x{100}]/8DM
+    \x{100}
+    Z\x{100}
+    \x{100}Z
+    *** Failers 
+
+/[Z\x{100}]/8DM
+    Z\x{100}
+    \x{100}
+    \x{100}Z
+    *** Failers 
+
+/[\x{200}-\x{100}]/8
+
+/[Ä€-Ä„]/8
+    \x{100}
+    \x{104}
+    *** Failers
+    \x{105}
+    \x{ff}    
+
+/[z-\x{100}]/8D
+
+/[z-\x{100}]/8Di
+
+/[z\Qa-d]Ä€\E]/8D
+    \x{100}
+    Ā 
 
 / End of testinput5 /
diff --git a/testdata/testinput6 b/testdata/testinput6
deleted file mode 100644
index 0074851..0000000
--- a/testdata/testinput6
+++ /dev/null
@@ -1,78 +0,0 @@
-/\x{100}/8DM
-
-/\x{1000}/8DM
-
-/\x{10000}/8DM
-
-/\x{100000}/8DM
-
-/\x{1000000}/8DM
-
-/\x{4000000}/8DM
-
-/\x{7fffFFFF}/8DM
-
-/[\x{ff}]/8DM
-
-/[\x{100}]/8DM
-
-/\x{ffffffff}/8
-
-/\x{100000000}/8
-
-/^\x{100}a\x{1234}/8
-    \x{100}a\x{1234}bcd
-
-/\x80/8D
-
-/\xff/8D
-
-/\x{0041}\x{2262}\x{0391}\x{002e}/D8
-    \x{0041}\x{2262}\x{0391}\x{002e}
-    
-/\x{D55c}\x{ad6d}\x{C5B4}/D8 
-    \x{D55c}\x{ad6d}\x{C5B4} 
-
-/\x{65e5}\x{672c}\x{8a9e}/D8
-    \x{65e5}\x{672c}\x{8a9e}
-
-/\x{80}/D8
-
-/\x{084}/D8
-
-/\x{104}/D8
-
-/\x{861}/D8
-
-/\x{212ab}/D8
-
-/.{3,5}X/D8
-    \x{212ab}\x{212ab}\x{212ab}\x{861}X
-
-
-/.{3,5}?/D8
-    \x{212ab}\x{212ab}\x{212ab}\x{861}
-
-/-- These tests are here rather than in testinput5 because Perl 5.6 has --/
-/-- some problems with UTF-8 support, in the area of \x{..} where the   --/
-/-- value is < 255. It grumbles about invalid UTF-8 strings.            --/
-
-/^[a\x{c0}]b/8
-    \x{c0}b
-    
-/^([a\x{c0}]*?)aa/8
-    a\x{c0}aaaa/ 
-
-/^([a\x{c0}]*?)aa/8
-    a\x{c0}aaaa/ 
-    a\x{c0}a\x{c0}aaa/ 
-
-/^([a\x{c0}]*)aa/8
-    a\x{c0}aaaa/ 
-    a\x{c0}a\x{c0}aaa/ 
-
-/^([a\x{c0}]*)a\x{c0}/8
-    a\x{c0}aaaa/ 
-    a\x{c0}a\x{c0}aaa/ 
-
-/ End of testinput6 /
diff --git a/testdata/testoutput1 b/testdata/testoutput1
index f0047ff..a01bb93 100644
--- a/testdata/testoutput1
+++ b/testdata/testoutput1
@@ -1,4 +1,4 @@
-PCRE version 3.9 02-Jan-2002
+PCRE version 4.0 17-Feb-2003
 
 /the quick brown fox/
     the quick brown fox
@@ -1941,7 +1941,7 @@ No match
 /^[W-c]+$/
     WXY_^abc
  0: WXY_^abc
-    ***Failers
+    *** Failers
 No match
     wxy
 No match
@@ -2224,7 +2224,7 @@ No match
  0: abc\x01de
  1: abc
 
-/a.b(?s)/
+/(?s)a.b/
     a\nb
  0: a\x0ab
 
@@ -3014,5 +3014,3234 @@ No match
  0: ABABAB
  1: AB
     
+/(?<!bar)foo/
+    foo
+ 0: foo
+    catfood
+ 0: foo
+    arfootle
+ 0: foo
+    rfoosh
+ 0: foo
+    *** Failers
+No match
+    barfoo
+No match
+    towbarfoo
+No match
+
+/\w{3}(?<!bar)foo/
+    catfood
+ 0: catfoo
+    *** Failers
+No match
+    foo
+No match
+    barfoo
+No match
+    towbarfoo
+No match
+
+/(?<=(foo)a)bar/
+    fooabar
+ 0: bar
+ 1: foo
+    *** Failers
+No match
+    bar
+No match
+    foobbar
+No match
+      
+/\Aabc\z/m
+    abc
+ 0: abc
+    *** Failers
+No match
+    abc\n   
+No match
+    qqq\nabc
+No match
+    abc\nzzz
+No match
+    qqq\nabc\nzzz
+No match
+
+"(?>.*/)foo"
+    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/it/you/see/
+No match
+
+"(?>.*/)foo"
+    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
+ 0: /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
+
+/(?>(\.\d\d[1-9]?))\d+/
+    1.230003938
+ 0: .230003938
+ 1: .23
+    1.875000282
+ 0: .875000282
+ 1: .875
+    *** Failers 
+No match
+    1.235 
+No match
+
+/^((?>\w+)|(?>\s+))*$/
+    now is the time for all good men to come to the aid of the party
+ 0: now is the time for all good men to come to the aid of the party
+ 1: party
+    *** Failers
+No match
+    this is not a line with only words and spaces!
+No match
+    
+/(\d+)(\w)/
+    12345a
+ 0: 12345a
+ 1: 12345
+ 2: a
+    12345+ 
+ 0: 12345
+ 1: 1234
+ 2: 5
+
+/((?>\d+))(\w)/
+    12345a
+ 0: 12345a
+ 1: 12345
+ 2: a
+    *** Failers
+No match
+    12345+ 
+No match
+
+/(?>a+)b/
+    aaab
+ 0: aaab
+
+/((?>a+)b)/
+    aaab
+ 0: aaab
+ 1: aaab
+
+/(?>(a+))b/
+    aaab
+ 0: aaab
+ 1: aaa
+
+/(?>b)+/
+    aaabbbccc
+ 0: bbb
+
+/(?>a+|b+|c+)*c/
+    aaabbbbccccd
+ 0: aaabbbbc
+
+/((?>[^()]+)|\([^()]*\))+/
+    ((abc(ade)ufh()()x
+ 0: abc(ade)ufh()()x
+ 1: x
+    
+/\(((?>[^()]+)|\([^()]+\))+\)/ 
+    (abc)
+ 0: (abc)
+ 1: abc
+    (abc(def)xyz)
+ 0: (abc(def)xyz)
+ 1: xyz
+    *** Failers
+No match
+    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
+No match
+
+/a(?-i)b/i
+    ab
+ 0: ab
+    Ab
+ 0: Ab
+    *** Failers 
+No match
+    aB
+No match
+    AB
+No match
+        
+/(a (?x)b c)d e/
+    a bcd e
+ 0: a bcd e
+ 1: a bc
+    *** Failers
+No match
+    a b cd e
+No match
+    abcd e   
+No match
+    a bcde 
+No match
+ 
+/(a b(?x)c d (?-x)e f)/
+    a bcde f
+ 0: a bcde f
+ 1: a bcde f
+    *** Failers
+No match
+    abcdef  
+No match
+
+/(a(?i)b)c/
+    abc
+ 0: abc
+ 1: ab
+    aBc
+ 0: aBc
+ 1: aB
+    *** Failers
+No match
+    abC
+No match
+    aBC  
+No match
+    Abc
+No match
+    ABc
+No match
+    ABC
+No match
+    AbC
+No match
+    
+/a(?i:b)c/
+    abc
+ 0: abc
+    aBc
+ 0: aBc
+    *** Failers 
+No match
+    ABC
+No match
+    abC
+No match
+    aBC
+No match
+    
+/a(?i:b)*c/
+    aBc
+ 0: aBc
+    aBBc
+ 0: aBBc
+    *** Failers 
+No match
+    aBC
+No match
+    aBBC
+No match
+    
+/a(?=b(?i)c)\w\wd/
+    abcd
+ 0: abcd
+    abCd
+ 0: abCd
+    *** Failers
+No match
+    aBCd
+No match
+    abcD     
+No match
+    
+/(?s-i:more.*than).*million/i
+    more than million
+ 0: more than million
+    more than MILLION
+ 0: more than MILLION
+    more \n than Million 
+ 0: more \x0a than Million
+    *** Failers
+No match
+    MORE THAN MILLION    
+No match
+    more \n than \n million 
+No match
+
+/(?:(?s-i)more.*than).*million/i
+    more than million
+ 0: more than million
+    more than MILLION
+ 0: more than MILLION
+    more \n than Million 
+ 0: more \x0a than Million
+    *** Failers
+No match
+    MORE THAN MILLION    
+No match
+    more \n than \n million 
+No match
+    
+/(?>a(?i)b+)+c/ 
+    abc
+ 0: abc
+    aBbc
+ 0: aBbc
+    aBBc 
+ 0: aBBc
+    *** Failers
+No match
+    Abc
+No match
+    abAb    
+No match
+    abbC 
+No match
+    
+/(?=a(?i)b)\w\wc/
+    abc
+ 0: abc
+    aBc
+ 0: aBc
+    *** Failers
+No match
+    Ab 
+No match
+    abC
+No match
+    aBC     
+No match
+    
+/(?<=a(?i)b)(\w\w)c/
+    abxxc
+ 0: xxc
+ 1: xx
+    aBxxc
+ 0: xxc
+ 1: xx
+    *** Failers
+No match
+    Abxxc
+No match
+    ABxxc
+No match
+    abxxC      
+No match
+
+/(?:(a)|b)(?(1)A|B)/
+    aA
+ 0: aA
+ 1: a
+    bB
+ 0: bB
+    *** Failers
+No match
+    aB
+No match
+    bA    
+No match
+
+/^(a)?(?(1)a|b)+$/
+    aa
+ 0: aa
+ 1: a
+    b
+ 0: b
+    bb  
+ 0: bb
+    *** Failers
+No match
+    ab   
+No match
+
+/^(?(?=abc)\w{3}:|\d\d)$/
+    abc:
+ 0: abc:
+    12
+ 0: 12
+    *** Failers
+No match
+    123
+No match
+    xyz    
+No match
+
+/^(?(?!abc)\d\d|\w{3}:)$/
+    abc:
+ 0: abc:
+    12
+ 0: 12
+    *** Failers
+No match
+    123
+No match
+    xyz    
+No match
+    
+/(?(?<=foo)bar|cat)/
+    foobar
+ 0: bar
+    cat
+ 0: cat
+    fcat
+ 0: cat
+    focat   
+ 0: cat
+    *** Failers
+No match
+    foocat  
+No match
+
+/(?(?<!foo)cat|bar)/
+    foobar
+ 0: bar
+    cat
+ 0: cat
+    fcat
+ 0: cat
+    focat   
+ 0: cat
+    *** Failers
+No match
+    foocat  
+No match
+
+/( \( )? [^()]+ (?(1) \) |) /x
+    abcd
+ 0: abcd
+    (abcd)
+ 0: (abcd)
+ 1: (
+    the quick (abcd) fox
+ 0: the quick 
+    (abcd   
+ 0: abcd
+
+/( \( )? [^()]+ (?(1) \) ) /x
+    abcd
+ 0: abcd
+    (abcd)
+ 0: (abcd)
+ 1: (
+    the quick (abcd) fox
+ 0: the quick 
+    (abcd   
+ 0: abcd
+
+/^(?(2)a|(1)(2))+$/
+    12
+ 0: 12
+ 1: 1
+ 2: 2
+    12a
+ 0: 12a
+ 1: 1
+ 2: 2
+    12aa
+ 0: 12aa
+ 1: 1
+ 2: 2
+    *** Failers
+No match
+    1234    
+No match
+
+/((?i)blah)\s+\1/
+    blah blah
+ 0: blah blah
+ 1: blah
+    BLAH BLAH
+ 0: BLAH BLAH
+ 1: BLAH
+    Blah Blah
+ 0: Blah Blah
+ 1: Blah
+    blaH blaH
+ 0: blaH blaH
+ 1: blaH
+    *** Failers
+No match
+    blah BLAH
+No match
+    Blah blah      
+No match
+    blaH blah 
+No match
+
+/((?i)blah)\s+(?i:\1)/
+    blah blah
+ 0: blah blah
+ 1: blah
+    BLAH BLAH
+ 0: BLAH BLAH
+ 1: BLAH
+    Blah Blah
+ 0: Blah Blah
+ 1: Blah
+    blaH blaH
+ 0: blaH blaH
+ 1: blaH
+    blah BLAH
+ 0: blah BLAH
+ 1: blah
+    Blah blah      
+ 0: Blah blah
+ 1: Blah
+    blaH blah 
+ 0: blaH blah
+ 1: blaH
+
+/(?>a*)*/
+    a
+ 0: a
+    aa
+ 0: aa
+    aaaa
+ 0: aaaa
+    
+/(abc|)+/
+    abc
+ 0: abc
+ 1: 
+    abcabc
+ 0: abcabc
+ 1: 
+    abcabcabc
+ 0: abcabcabc
+ 1: 
+    xyz      
+ 0: 
+ 1: 
+
+/([a]*)*/
+    a
+ 0: a
+ 1: 
+    aaaaa 
+ 0: aaaaa
+ 1: 
+ 
+/([ab]*)*/
+    a
+ 0: a
+ 1: 
+    b
+ 0: b
+ 1: 
+    ababab
+ 0: ababab
+ 1: 
+    aaaabcde
+ 0: aaaab
+ 1: 
+    bbbb    
+ 0: bbbb
+ 1: 
+ 
+/([^a]*)*/
+    b
+ 0: b
+ 1: 
+    bbbb
+ 0: bbbb
+ 1: 
+    aaa   
+ 0: 
+ 1: 
+ 
+/([^ab]*)*/
+    cccc
+ 0: cccc
+ 1: 
+    abab  
+ 0: 
+ 1: 
+ 
+/([a]*?)*/
+    a
+ 0: 
+ 1: 
+    aaaa 
+ 0: 
+ 1: 
+ 
+/([ab]*?)*/
+    a
+ 0: 
+ 1: 
+    b
+ 0: 
+ 1: 
+    abab
+ 0: 
+ 1: 
+    baba   
+ 0: 
+ 1: 
+ 
+/([^a]*?)*/
+    b
+ 0: 
+ 1: 
+    bbbb
+ 0: 
+ 1: 
+    aaa   
+ 0: 
+ 1: 
+ 
+/([^ab]*?)*/
+    c
+ 0: 
+ 1: 
+    cccc
+ 0: 
+ 1: 
+    baba   
+ 0: 
+ 1: 
+ 
+/(?>a*)*/
+    a
+ 0: a
+    aaabcde 
+ 0: aaa
+ 
+/((?>a*))*/
+    aaaaa
+ 0: aaaaa
+ 1: 
+    aabbaa 
+ 0: aa
+ 1: 
+ 
+/((?>a*?))*/
+    aaaaa
+ 0: 
+ 1: 
+    aabbaa 
+ 0: 
+ 1: 
+
+/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /x
+    12-sep-98
+ 0: 12-sep-98
+    12-09-98
+ 0: 12-09-98
+    *** Failers
+No match
+    sep-12-98
+No match
+        
+/(?<=(foo))bar\1/
+    foobarfoo
+ 0: barfoo
+ 1: foo
+    foobarfootling 
+ 0: barfoo
+ 1: foo
+    *** Failers
+No match
+    foobar
+No match
+    barfoo   
+No match
+
+/(?i:saturday|sunday)/
+    saturday
+ 0: saturday
+    sunday
+ 0: sunday
+    Saturday
+ 0: Saturday
+    Sunday
+ 0: Sunday
+    SATURDAY
+ 0: SATURDAY
+    SUNDAY
+ 0: SUNDAY
+    SunDay
+ 0: SunDay
+    
+/(a(?i)bc|BB)x/
+    abcx
+ 0: abcx
+ 1: abc
+    aBCx
+ 0: aBCx
+ 1: aBC
+    bbx
+ 0: bbx
+ 1: bb
+    BBx
+ 0: BBx
+ 1: BB
+    *** Failers
+No match
+    abcX
+No match
+    aBCX
+No match
+    bbX
+No match
+    BBX               
+No match
+
+/^([ab](?i)[cd]|[ef])/
+    ac
+ 0: ac
+ 1: ac
+    aC
+ 0: aC
+ 1: aC
+    bD
+ 0: bD
+ 1: bD
+    elephant
+ 0: e
+ 1: e
+    Europe 
+ 0: E
+ 1: E
+    frog
+ 0: f
+ 1: f
+    France
+ 0: F
+ 1: F
+    *** Failers
+No match
+    Africa     
+No match
+
+/^(ab|a(?i)[b-c](?m-i)d|x(?i)y|z)/
+    ab
+ 0: ab
+ 1: ab
+    aBd
+ 0: aBd
+ 1: aBd
+    xy
+ 0: xy
+ 1: xy
+    xY
+ 0: xY
+ 1: xY
+    zebra
+ 0: z
+ 1: z
+    Zambesi
+ 0: Z
+ 1: Z
+    *** Failers
+No match
+    aCD  
+No match
+    XY  
+No match
+
+/(?<=foo\n)^bar/m
+    foo\nbar
+ 0: bar
+    *** Failers
+No match
+    bar
+No match
+    baz\nbar   
+No match
+
+/(?<=(?<!foo)bar)baz/
+    barbaz
+ 0: baz
+    barbarbaz 
+ 0: baz
+    koobarbaz 
+ 0: baz
+    *** Failers
+No match
+    baz
+No match
+    foobarbaz 
+No match
+
+/The case of aaaaaa is missed out below because I think Perl 5.005_02 gets/
+/it wrong; it sets $1 to aaa rather than aa. Compare the following test,/
+No match
+/where it does set $1 to aa when matching aaaaaa./
+No match
+
+/^(a\1?){4}$/
+    a
+No match
+    aa
+No match
+    aaa
+No match
+    aaaa
+ 0: aaaa
+ 1: a
+    aaaaa
+ 0: aaaaa
+ 1: a
+    aaaaaaa
+ 0: aaaaaaa
+ 1: a
+    aaaaaaaa
+No match
+    aaaaaaaaa
+No match
+    aaaaaaaaaa
+ 0: aaaaaaaaaa
+ 1: aaaa
+    aaaaaaaaaaa
+No match
+    aaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaaaaa               
+No match
+
+/^(a\1?)(a\1?)(a\2?)(a\3?)$/
+    a
+No match
+    aa
+No match
+    aaa
+No match
+    aaaa
+ 0: aaaa
+ 1: a
+ 2: a
+ 3: a
+ 4: a
+    aaaaa
+ 0: aaaaa
+ 1: a
+ 2: aa
+ 3: a
+ 4: a
+    aaaaaa
+ 0: aaaaaa
+ 1: a
+ 2: aa
+ 3: a
+ 4: aa
+    aaaaaaa
+ 0: aaaaaaa
+ 1: a
+ 2: aa
+ 3: aaa
+ 4: a
+    aaaaaaaa
+No match
+    aaaaaaaaa
+No match
+    aaaaaaaaaa
+ 0: aaaaaaaaaa
+ 1: a
+ 2: aa
+ 3: aaa
+ 4: aaaa
+    aaaaaaaaaaa
+No match
+    aaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaaaa
+No match
+    aaaaaaaaaaaaaaaa               
+No match
+
+/The following tests are taken from the Perl 5.005 test suite; some of them/
+/are compatible with 5.004, but I'd rather not have to sort them out./
+No match
+
+/abc/
+    abc
+ 0: abc
+    xabcy
+ 0: abc
+    ababc
+ 0: abc
+    *** Failers
+No match
+    xbc
+No match
+    axc
+No match
+    abx
+No match
+
+/ab*c/
+    abc
+ 0: abc
+
+/ab*bc/
+    abc
+ 0: abc
+    abbc
+ 0: abbc
+    abbbbc
+ 0: abbbbc
+
+/.{1}/
+    abbbbc
+ 0: a
+
+/.{3,4}/
+    abbbbc
+ 0: abbb
+
+/ab{0,}bc/
+    abbbbc
+ 0: abbbbc
+
+/ab+bc/
+    abbc
+ 0: abbc
+    *** Failers
+No match
+    abc
+No match
+    abq
+No match
+
+/ab{1,}bc/
+
+/ab+bc/
+    abbbbc
+ 0: abbbbc
+
+/ab{1,}bc/
+    abbbbc
+ 0: abbbbc
+
+/ab{1,3}bc/
+    abbbbc
+ 0: abbbbc
+
+/ab{3,4}bc/
+    abbbbc
+ 0: abbbbc
+
+/ab{4,5}bc/
+    *** Failers
+No match
+    abq
+No match
+    abbbbc
+No match
+
+/ab?bc/
+    abbc
+ 0: abbc
+    abc
+ 0: abc
+
+/ab{0,1}bc/
+    abc
+ 0: abc
+
+/ab?bc/
+
+/ab?c/
+    abc
+ 0: abc
+
+/ab{0,1}c/
+    abc
+ 0: abc
+
+/^abc$/
+    abc
+ 0: abc
+    *** Failers
+No match
+    abbbbc
+No match
+    abcc
+No match
+
+/^abc/
+    abcc
+ 0: abc
+
+/^abc$/
+
+/abc$/
+    aabc
+ 0: abc
+    *** Failers
+No match
+    aabc
+ 0: abc
+    aabcd
+No match
+
+/^/
+    abc
+ 0: 
+
+/$/
+    abc
+ 0: 
+
+/a.c/
+    abc
+ 0: abc
+    axc
+ 0: axc
+
+/a.*c/
+    axyzc
+ 0: axyzc
+
+/a[bc]d/
+    abd
+ 0: abd
+    *** Failers
+No match
+    axyzd
+No match
+    abc
+No match
+
+/a[b-d]e/
+    ace
+ 0: ace
+
+/a[b-d]/
+    aac
+ 0: ac
+
+/a[-b]/
+    a-
+ 0: a-
+
+/a[b-]/
+    a-
+ 0: a-
+
+/a]/
+    a]
+ 0: a]
+
+/a[]]b/
+    a]b
+ 0: a]b
+
+/a[^bc]d/
+    aed
+ 0: aed
+    *** Failers
+No match
+    abd
+No match
+    abd
+No match
+
+/a[^-b]c/
+    adc
+ 0: adc
+
+/a[^]b]c/
+    adc
+ 0: adc
+    *** Failers
+No match
+    a-c
+ 0: a-c
+    a]c
+No match
+
+/\ba\b/
+    a-
+ 0: a
+    -a
+ 0: a
+    -a-
+ 0: a
+
+/\by\b/
+    *** Failers
+No match
+    xy
+No match
+    yz
+No match
+    xyz
+No match
+
+/\Ba\B/
+    *** Failers
+ 0: a
+    a-
+No match
+    -a
+No match
+    -a-
+No match
+
+/\By\b/
+    xy
+ 0: y
+
+/\by\B/
+    yz
+ 0: y
+
+/\By\B/
+    xyz
+ 0: y
+
+/\w/
+    a
+ 0: a
+
+/\W/
+    -
+ 0: -
+    *** Failers
+ 0: *
+    -
+ 0: -
+    a
+No match
+
+/a\sb/
+    a b
+ 0: a b
+
+/a\Sb/
+    a-b
+ 0: a-b
+    *** Failers
+No match
+    a-b
+ 0: a-b
+    a b
+No match
+
+/\d/
+    1
+ 0: 1
+
+/\D/
+    -
+ 0: -
+    *** Failers
+ 0: *
+    -
+ 0: -
+    1
+No match
+
+/[\w]/
+    a
+ 0: a
+
+/[\W]/
+    -
+ 0: -
+    *** Failers
+ 0: *
+    -
+ 0: -
+    a
+No match
+
+/a[\s]b/
+    a b
+ 0: a b
+
+/a[\S]b/
+    a-b
+ 0: a-b
+    *** Failers
+No match
+    a-b
+ 0: a-b
+    a b
+No match
+
+/[\d]/
+    1
+ 0: 1
+
+/[\D]/
+    -
+ 0: -
+    *** Failers
+ 0: *
+    -
+ 0: -
+    1
+No match
+
+/ab|cd/
+    abc
+ 0: ab
+    abcd
+ 0: ab
+
+/()ef/
+    def
+ 0: ef
+ 1: 
+
+/$b/
+
+/a\(b/
+    a(b
+ 0: a(b
+
+/a\(*b/
+    ab
+ 0: ab
+    a((b
+ 0: a((b
+
+/a\\b/
+    a\b
+No match
+
+/((a))/
+    abc
+ 0: a
+ 1: a
+ 2: a
+
+/(a)b(c)/
+    abc
+ 0: abc
+ 1: a
+ 2: c
+
+/a+b+c/
+    aabbabc
+ 0: abc
+
+/a{1,}b{1,}c/
+    aabbabc
+ 0: abc
+
+/a.+?c/
+    abcabc
+ 0: abc
+
+/(a+|b)*/
+    ab
+ 0: ab
+ 1: b
+
+/(a+|b){0,}/
+    ab
+ 0: ab
+ 1: b
+
+/(a+|b)+/
+    ab
+ 0: ab
+ 1: b
+
+/(a+|b){1,}/
+    ab
+ 0: ab
+ 1: b
+
+/(a+|b)?/
+    ab
+ 0: a
+ 1: a
+
+/(a+|b){0,1}/
+    ab
+ 0: a
+ 1: a
+
+/[^ab]*/
+    cde
+ 0: cde
+
+/abc/
+    *** Failers
+No match
+    b
+No match
+    
+
+/a*/
+    
+
+/([abc])*d/
+    abbbcd
+ 0: abbbcd
+ 1: c
+
+/([abc])*bcd/
+    abcd
+ 0: abcd
+ 1: a
+
+/a|b|c|d|e/
+    e
+ 0: e
+
+/(a|b|c|d|e)f/
+    ef
+ 0: ef
+ 1: e
+
+/abcd*efg/
+    abcdefg
+ 0: abcdefg
+
+/ab*/
+    xabyabbbz
+ 0: ab
+    xayabbbz
+ 0: a
+
+/(ab|cd)e/
+    abcde
+ 0: cde
+ 1: cd
+
+/[abhgefdc]ij/
+    hij
+ 0: hij
+
+/^(ab|cd)e/
+
+/(abc|)ef/
+    abcdef
+ 0: ef
+ 1: 
+
+/(a|b)c*d/
+    abcd
+ 0: bcd
+ 1: b
+
+/(ab|ab*)bc/
+    abc
+ 0: abc
+ 1: a
+
+/a([bc]*)c*/
+    abc
+ 0: abc
+ 1: bc
+
+/a([bc]*)(c*d)/
+    abcd
+ 0: abcd
+ 1: bc
+ 2: d
+
+/a([bc]+)(c*d)/
+    abcd
+ 0: abcd
+ 1: bc
+ 2: d
+
+/a([bc]*)(c+d)/
+    abcd
+ 0: abcd
+ 1: b
+ 2: cd
+
+/a[bcd]*dcdcde/
+    adcdcde
+ 0: adcdcde
+
+/a[bcd]+dcdcde/
+    *** Failers
+No match
+    abcde
+No match
+    adcdcde
+No match
+
+/(ab|a)b*c/
+    abc
+ 0: abc
+ 1: ab
+
+/((a)(b)c)(d)/
+    abcd
+ 0: abcd
+ 1: abc
+ 2: a
+ 3: b
+ 4: d
+
+/[a-zA-Z_][a-zA-Z0-9_]*/
+    alpha
+ 0: alpha
+
+/^a(bc+|b[eh])g|.h$/
+    abh
+ 0: bh
+
+/(bc+d$|ef*g.|h?i(j|k))/
+    effgz
+ 0: effgz
+ 1: effgz
+    ij
+ 0: ij
+ 1: ij
+ 2: j
+    reffgz
+ 0: effgz
+ 1: effgz
+    *** Failers
+No match
+    effg
+No match
+    bcdd
+No match
+
+/((((((((((a))))))))))/
+    a
+ 0: a
+ 1: a
+ 2: a
+ 3: a
+ 4: a
+ 5: a
+ 6: a
+ 7: a
+ 8: a
+ 9: a
+10: a
+
+/((((((((((a))))))))))\10/
+    aa
+ 0: aa
+ 1: a
+ 2: a
+ 3: a
+ 4: a
+ 5: a
+ 6: a
+ 7: a
+ 8: a
+ 9: a
+10: a
+
+/(((((((((a)))))))))/
+    a
+ 0: a
+ 1: a
+ 2: a
+ 3: a
+ 4: a
+ 5: a
+ 6: a
+ 7: a
+ 8: a
+ 9: a
+
+/multiple words of text/
+    *** Failers
+No match
+    aa
+No match
+    uh-uh
+No match
+
+/multiple words/
+    multiple words, yeah
+ 0: multiple words
+
+/(.*)c(.*)/
+    abcde
+ 0: abcde
+ 1: ab
+ 2: de
+
+/\((.*), (.*)\)/
+    (a, b)
+ 0: (a, b)
+ 1: a
+ 2: b
+
+/[k]/
+
+/abcd/
+    abcd
+ 0: abcd
+
+/a(bc)d/
+    abcd
+ 0: abcd
+ 1: bc
+
+/a[-]?c/
+    ac
+ 0: ac
+
+/(abc)\1/
+    abcabc
+ 0: abcabc
+ 1: abc
+
+/([a-c]*)\1/
+    abcabc
+ 0: abcabc
+ 1: abc
+
+/(a)|\1/
+    a
+ 0: a
+ 1: a
+    *** Failers
+ 0: a
+ 1: a
+    ab
+ 0: a
+ 1: a
+    x
+No match
+
+/(([a-c])b*?\2)*/
+    ababbbcbc
+ 0: ababb
+ 1: bb
+ 2: b
+
+/(([a-c])b*?\2){3}/
+    ababbbcbc
+ 0: ababbbcbc
+ 1: cbc
+ 2: c
+
+/((\3|b)\2(a)x)+/
+    aaaxabaxbaaxbbax
+ 0: bbax
+ 1: bbax
+ 2: b
+ 3: a
+
+/((\3|b)\2(a)){2,}/
+    bbaababbabaaaaabbaaaabba
+ 0: bbaaaabba
+ 1: bba
+ 2: b
+ 3: a
+
+/abc/i
+    ABC
+ 0: ABC
+    XABCY
+ 0: ABC
+    ABABC
+ 0: ABC
+    *** Failers
+No match
+    aaxabxbaxbbx
+No match
+    XBC
+No match
+    AXC
+No match
+    ABX
+No match
+
+/ab*c/i
+    ABC
+ 0: ABC
+
+/ab*bc/i
+    ABC
+ 0: ABC
+    ABBC
+ 0: ABBC
+
+/ab*?bc/i
+    ABBBBC
+ 0: ABBBBC
+
+/ab{0,}?bc/i
+    ABBBBC
+ 0: ABBBBC
+
+/ab+?bc/i
+    ABBC
+ 0: ABBC
+
+/ab+bc/i
+    *** Failers
+No match
+    ABC
+No match
+    ABQ
+No match
+
+/ab{1,}bc/i
+
+/ab+bc/i
+    ABBBBC
+ 0: ABBBBC
+
+/ab{1,}?bc/i
+    ABBBBC
+ 0: ABBBBC
+
+/ab{1,3}?bc/i
+    ABBBBC
+ 0: ABBBBC
+
+/ab{3,4}?bc/i
+    ABBBBC
+ 0: ABBBBC
+
+/ab{4,5}?bc/i
+    *** Failers
+No match
+    ABQ
+No match
+    ABBBBC
+No match
+
+/ab??bc/i
+    ABBC
+ 0: ABBC
+    ABC
+ 0: ABC
+
+/ab{0,1}?bc/i
+    ABC
+ 0: ABC
+
+/ab??bc/i
+
+/ab??c/i
+    ABC
+ 0: ABC
+
+/ab{0,1}?c/i
+    ABC
+ 0: ABC
+
+/^abc$/i
+    ABC
+ 0: ABC
+    *** Failers
+No match
+    ABBBBC
+No match
+    ABCC
+No match
+
+/^abc/i
+    ABCC
+ 0: ABC
+
+/^abc$/i
+
+/abc$/i
+    AABC
+ 0: ABC
+
+/^/i
+    ABC
+ 0: 
+
+/$/i
+    ABC
+ 0: 
+
+/a.c/i
+    ABC
+ 0: ABC
+    AXC
+ 0: AXC
+
+/a.*?c/i
+    AXYZC
+ 0: AXYZC
+
+/a.*c/i
+    *** Failers
+No match
+    AABC
+ 0: AABC
+    AXYZD
+No match
+
+/a[bc]d/i
+    ABD
+ 0: ABD
+
+/a[b-d]e/i
+    ACE
+ 0: ACE
+    *** Failers
+No match
+    ABC
+No match
+    ABD
+No match
+
+/a[b-d]/i
+    AAC
+ 0: AC
+
+/a[-b]/i
+    A-
+ 0: A-
+
+/a[b-]/i
+    A-
+ 0: A-
+
+/a]/i
+    A]
+ 0: A]
+
+/a[]]b/i
+    A]B
+ 0: A]B
+
+/a[^bc]d/i
+    AED
+ 0: AED
+
+/a[^-b]c/i
+    ADC
+ 0: ADC
+    *** Failers
+No match
+    ABD
+No match
+    A-C
+No match
+
+/a[^]b]c/i
+    ADC
+ 0: ADC
+
+/ab|cd/i
+    ABC
+ 0: AB
+    ABCD
+ 0: AB
+
+/()ef/i
+    DEF
+ 0: EF
+ 1: 
+
+/$b/i
+    *** Failers
+No match
+    A]C
+No match
+    B
+No match
+
+/a\(b/i
+    A(B
+ 0: A(B
+
+/a\(*b/i
+    AB
+ 0: AB
+    A((B
+ 0: A((B
+
+/a\\b/i
+    A\B
+No match
+
+/((a))/i
+    ABC
+ 0: A
+ 1: A
+ 2: A
+
+/(a)b(c)/i
+    ABC
+ 0: ABC
+ 1: A
+ 2: C
+
+/a+b+c/i
+    AABBABC
+ 0: ABC
+
+/a{1,}b{1,}c/i
+    AABBABC
+ 0: ABC
+
+/a.+?c/i
+    ABCABC
+ 0: ABC
+
+/a.*?c/i
+    ABCABC
+ 0: ABC
+
+/a.{0,5}?c/i
+    ABCABC
+ 0: ABC
+
+/(a+|b)*/i
+    AB
+ 0: AB
+ 1: B
+
+/(a+|b){0,}/i
+    AB
+ 0: AB
+ 1: B
+
+/(a+|b)+/i
+    AB
+ 0: AB
+ 1: B
+
+/(a+|b){1,}/i
+    AB
+ 0: AB
+ 1: B
+
+/(a+|b)?/i
+    AB
+ 0: A
+ 1: A
+
+/(a+|b){0,1}/i
+    AB
+ 0: A
+ 1: A
+
+/(a+|b){0,1}?/i
+    AB
+ 0: 
+
+/[^ab]*/i
+    CDE
+ 0: CDE
+
+/abc/i
+
+/a*/i
+    
+
+/([abc])*d/i
+    ABBBCD
+ 0: ABBBCD
+ 1: C
+
+/([abc])*bcd/i
+    ABCD
+ 0: ABCD
+ 1: A
+
+/a|b|c|d|e/i
+    E
+ 0: E
+
+/(a|b|c|d|e)f/i
+    EF
+ 0: EF
+ 1: E
+
+/abcd*efg/i
+    ABCDEFG
+ 0: ABCDEFG
+
+/ab*/i
+    XABYABBBZ
+ 0: AB
+    XAYABBBZ
+ 0: A
+
+/(ab|cd)e/i
+    ABCDE
+ 0: CDE
+ 1: CD
+
+/[abhgefdc]ij/i
+    HIJ
+ 0: HIJ
+
+/^(ab|cd)e/i
+    ABCDE
+No match
+
+/(abc|)ef/i
+    ABCDEF
+ 0: EF
+ 1: 
+
+/(a|b)c*d/i
+    ABCD
+ 0: BCD
+ 1: B
+
+/(ab|ab*)bc/i
+    ABC
+ 0: ABC
+ 1: A
+
+/a([bc]*)c*/i
+    ABC
+ 0: ABC
+ 1: BC
+
+/a([bc]*)(c*d)/i
+    ABCD
+ 0: ABCD
+ 1: BC
+ 2: D
+
+/a([bc]+)(c*d)/i
+    ABCD
+ 0: ABCD
+ 1: BC
+ 2: D
+
+/a([bc]*)(c+d)/i
+    ABCD
+ 0: ABCD
+ 1: B
+ 2: CD
+
+/a[bcd]*dcdcde/i
+    ADCDCDE
+ 0: ADCDCDE
+
+/a[bcd]+dcdcde/i
+
+/(ab|a)b*c/i
+    ABC
+ 0: ABC
+ 1: AB
+
+/((a)(b)c)(d)/i
+    ABCD
+ 0: ABCD
+ 1: ABC
+ 2: A
+ 3: B
+ 4: D
+
+/[a-zA-Z_][a-zA-Z0-9_]*/i
+    ALPHA
+ 0: ALPHA
+
+/^a(bc+|b[eh])g|.h$/i
+    ABH
+ 0: BH
+
+/(bc+d$|ef*g.|h?i(j|k))/i
+    EFFGZ
+ 0: EFFGZ
+ 1: EFFGZ
+    IJ
+ 0: IJ
+ 1: IJ
+ 2: J
+    REFFGZ
+ 0: EFFGZ
+ 1: EFFGZ
+    *** Failers
+No match
+    ADCDCDE
+No match
+    EFFG
+No match
+    BCDD
+No match
+
+/((((((((((a))))))))))/i
+    A
+ 0: A
+ 1: A
+ 2: A
+ 3: A
+ 4: A
+ 5: A
+ 6: A
+ 7: A
+ 8: A
+ 9: A
+10: A
+
+/((((((((((a))))))))))\10/i
+    AA
+ 0: AA
+ 1: A
+ 2: A
+ 3: A
+ 4: A
+ 5: A
+ 6: A
+ 7: A
+ 8: A
+ 9: A
+10: A
+
+/(((((((((a)))))))))/i
+    A
+ 0: A
+ 1: A
+ 2: A
+ 3: A
+ 4: A
+ 5: A
+ 6: A
+ 7: A
+ 8: A
+ 9: A
+
+/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/i
+    A
+ 0: A
+ 1: A
+
+/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/i
+    C
+ 0: C
+ 1: C
+
+/multiple words of text/i
+    *** Failers
+No match
+    AA
+No match
+    UH-UH
+No match
+
+/multiple words/i
+    MULTIPLE WORDS, YEAH
+ 0: MULTIPLE WORDS
+
+/(.*)c(.*)/i
+    ABCDE
+ 0: ABCDE
+ 1: AB
+ 2: DE
+
+/\((.*), (.*)\)/i
+    (A, B)
+ 0: (A, B)
+ 1: A
+ 2: B
+
+/[k]/i
+
+/abcd/i
+    ABCD
+ 0: ABCD
+
+/a(bc)d/i
+    ABCD
+ 0: ABCD
+ 1: BC
+
+/a[-]?c/i
+    AC
+ 0: AC
+
+/(abc)\1/i
+    ABCABC
+ 0: ABCABC
+ 1: ABC
+
+/([a-c]*)\1/i
+    ABCABC
+ 0: ABCABC
+ 1: ABC
+
+/a(?!b)./
+    abad
+ 0: ad
+
+/a(?=d)./
+    abad
+ 0: ad
+
+/a(?=c|d)./
+    abad
+ 0: ad
+
+/a(?:b|c|d)(.)/
+    ace
+ 0: ace
+ 1: e
+
+/a(?:b|c|d)*(.)/
+    ace
+ 0: ace
+ 1: e
+
+/a(?:b|c|d)+?(.)/
+    ace
+ 0: ace
+ 1: e
+    acdbcdbe
+ 0: acd
+ 1: d
+
+/a(?:b|c|d)+(.)/
+    acdbcdbe
+ 0: acdbcdbe
+ 1: e
+
+/a(?:b|c|d){2}(.)/
+    acdbcdbe
+ 0: acdb
+ 1: b
+
+/a(?:b|c|d){4,5}(.)/
+    acdbcdbe
+ 0: acdbcdb
+ 1: b
+
+/a(?:b|c|d){4,5}?(.)/
+    acdbcdbe
+ 0: acdbcd
+ 1: d
+
+/((foo)|(bar))*/
+    foobar
+ 0: foobar
+ 1: bar
+ 2: foo
+ 3: bar
+
+/a(?:b|c|d){6,7}(.)/
+    acdbcdbe
+ 0: acdbcdbe
+ 1: e
+
+/a(?:b|c|d){6,7}?(.)/
+    acdbcdbe
+ 0: acdbcdbe
+ 1: e
+
+/a(?:b|c|d){5,6}(.)/
+    acdbcdbe
+ 0: acdbcdbe
+ 1: e
+
+/a(?:b|c|d){5,6}?(.)/
+    acdbcdbe
+ 0: acdbcdb
+ 1: b
+
+/a(?:b|c|d){5,7}(.)/
+    acdbcdbe
+ 0: acdbcdbe
+ 1: e
+
+/a(?:b|c|d){5,7}?(.)/
+    acdbcdbe
+ 0: acdbcdb
+ 1: b
+
+/a(?:b|(c|e){1,2}?|d)+?(.)/
+    ace
+ 0: ace
+ 1: c
+ 2: e
+
+/^(.+)?B/
+    AB
+ 0: AB
+ 1: A
+
+/^([^a-z])|(\^)$/
+    .
+ 0: .
+ 1: .
+
+/^[<>]&/
+    <&OUT
+ 0: <&
+
+/^(a\1?){4}$/
+    aaaaaaaaaa
+ 0: aaaaaaaaaa
+ 1: aaaa
+    *** Failers
+No match
+    AB
+No match
+    aaaaaaaaa
+No match
+    aaaaaaaaaaa
+No match
+
+/^(a(?(1)\1)){4}$/
+    aaaaaaaaaa
+ 0: aaaaaaaaaa
+ 1: aaaa
+    *** Failers
+No match
+    aaaaaaaaa
+No match
+    aaaaaaaaaaa
+No match
+
+/(?:(f)(o)(o)|(b)(a)(r))*/
+    foobar
+ 0: foobar
+ 1: f
+ 2: o
+ 3: o
+ 4: b
+ 5: a
+ 6: r
+
+/(?<=a)b/
+    ab
+ 0: b
+    *** Failers
+No match
+    cb
+No match
+    b
+No match
+
+/(?<!c)b/
+    ab
+ 0: b
+    b
+ 0: b
+    b
+ 0: b
+
+/(?:..)*a/
+    aba
+ 0: aba
+
+/(?:..)*?a/
+    aba
+ 0: a
+
+/^(?:b|a(?=(.)))*\1/
+    abc
+ 0: ab
+ 1: b
+
+/^(){3,5}/
+    abc
+ 0: 
+ 1: 
+
+/^(a+)*ax/
+    aax
+ 0: aax
+ 1: a
+
+/^((a|b)+)*ax/
+    aax
+ 0: aax
+ 1: a
+ 2: a
+
+/^((a|bc)+)*ax/
+    aax
+ 0: aax
+ 1: a
+ 2: a
+
+/(a|x)*ab/
+    cab
+ 0: ab
+
+/(a)*ab/
+    cab
+ 0: ab
+
+/(?:(?i)a)b/
+    ab
+ 0: ab
+
+/((?i)a)b/
+    ab
+ 0: ab
+ 1: a
+
+/(?:(?i)a)b/
+    Ab
+ 0: Ab
+
+/((?i)a)b/
+    Ab
+ 0: Ab
+ 1: A
+
+/(?:(?i)a)b/
+    *** Failers
+No match
+    cb
+No match
+    aB
+No match
+
+/((?i)a)b/
+
+/(?i:a)b/
+    ab
+ 0: ab
+
+/((?i:a))b/
+    ab
+ 0: ab
+ 1: a
+
+/(?i:a)b/
+    Ab
+ 0: Ab
+
+/((?i:a))b/
+    Ab
+ 0: Ab
+ 1: A
+
+/(?i:a)b/
+    *** Failers
+No match
+    aB
+No match
+    aB
+No match
+
+/((?i:a))b/
+
+/(?:(?-i)a)b/i
+    ab
+ 0: ab
+
+/((?-i)a)b/i
+    ab
+ 0: ab
+ 1: a
+
+/(?:(?-i)a)b/i
+    aB
+ 0: aB
+
+/((?-i)a)b/i
+    aB
+ 0: aB
+ 1: a
+
+/(?:(?-i)a)b/i
+    *** Failers
+No match
+    aB
+ 0: aB
+    Ab
+No match
+
+/((?-i)a)b/i
+
+/(?:(?-i)a)b/i
+    aB
+ 0: aB
+
+/((?-i)a)b/i
+    aB
+ 0: aB
+ 1: a
+
+/(?:(?-i)a)b/i
+    *** Failers
+No match
+    Ab
+No match
+    AB
+No match
+
+/((?-i)a)b/i
+
+/(?-i:a)b/i
+    ab
+ 0: ab
+
+/((?-i:a))b/i
+    ab
+ 0: ab
+ 1: a
+
+/(?-i:a)b/i
+    aB
+ 0: aB
+
+/((?-i:a))b/i
+    aB
+ 0: aB
+ 1: a
+
+/(?-i:a)b/i
+    *** Failers
+No match
+    AB
+No match
+    Ab
+No match
+
+/((?-i:a))b/i
+
+/(?-i:a)b/i
+    aB
+ 0: aB
+
+/((?-i:a))b/i
+    aB
+ 0: aB
+ 1: a
+
+/(?-i:a)b/i
+    *** Failers
+No match
+    Ab
+No match
+    AB
+No match
+
+/((?-i:a))b/i
+
+/((?-i:a.))b/i
+    *** Failers
+No match
+    AB
+No match
+    a\nB
+No match
+
+/((?s-i:a.))b/i
+    a\nB
+ 0: a\x0aB
+ 1: a\x0a
+
+/(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))/
+    cabbbb
+ 0: cabbbb
+
+/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/
+    caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+ 0: caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+
+/(ab)\d\1/i
+    Ab4ab
+ 0: Ab4ab
+ 1: Ab
+    ab4Ab
+ 0: ab4Ab
+ 1: ab
+
+/foo\w*\d{4}baz/
+    foobar1234baz
+ 0: foobar1234baz
+
+/x(~~)*(?:(?:F)?)?/
+    x~~
+ 0: x~~
+ 1: ~~
+
+/^a(?#xxx){3}c/
+    aaac
+ 0: aaac
+
+/^a (?#xxx) (?#yyy) {3}c/x
+    aaac
+ 0: aaac
+
+/(?<![cd])b/
+    *** Failers
+No match
+    B\nB
+No match
+    dbcb
+No match
+
+/(?<![cd])[ab]/
+    dbaacb
+ 0: a
+
+/(?<!(c|d))b/
+
+/(?<!(c|d))[ab]/
+    dbaacb
+ 0: a
+
+/(?<!cd)[ab]/
+    cdaccb
+ 0: b
+
+/^(?:a?b?)*$/
+    *** Failers
+No match
+    dbcb
+No match
+    a--
+No match
+
+/((?s)^a(.))((?m)^b$)/
+    a\nb\nc\n
+ 0: a\x0ab
+ 1: a\x0a
+ 2: \x0a
+ 3: b
+
+/((?m)^b$)/
+    a\nb\nc\n
+ 0: b
+ 1: b
+
+/(?m)^b/
+    a\nb\n
+ 0: b
+
+/(?m)^(b)/
+    a\nb\n
+ 0: b
+ 1: b
+
+/((?m)^b)/
+    a\nb\n
+ 0: b
+ 1: b
+
+/\n((?m)^b)/
+    a\nb\n
+ 0: \x0ab
+ 1: b
+
+/((?s).)c(?!.)/
+    a\nb\nc\n
+ 0: \x0ac
+ 1: \x0a
+    a\nb\nc\n
+ 0: \x0ac
+ 1: \x0a
+
+/((?s)b.)c(?!.)/
+    a\nb\nc\n
+ 0: b\x0ac
+ 1: b\x0a
+    a\nb\nc\n
+ 0: b\x0ac
+ 1: b\x0a
+
+/^b/
+
+/()^b/
+    *** Failers
+No match
+    a\nb\nc\n
+No match
+    a\nb\nc\n
+No match
+
+/((?m)^b)/
+    a\nb\nc\n
+ 0: b
+ 1: b
+
+/(?(1)a|b)/
+
+/(?(1)b|a)/
+    a
+ 0: a
+
+/(x)?(?(1)a|b)/
+    *** Failers
+No match
+    a
+No match
+    a
+No match
+
+/(x)?(?(1)b|a)/
+    a
+ 0: a
+
+/()?(?(1)b|a)/
+    a
+ 0: a
+
+/()(?(1)b|a)/
+
+/()?(?(1)a|b)/
+    a
+ 0: a
+ 1: 
+
+/^(\()?blah(?(1)(\)))$/
+    (blah)
+ 0: (blah)
+ 1: (
+ 2: )
+    blah
+ 0: blah
+    *** Failers
+No match
+    a
+No match
+    blah)
+No match
+    (blah
+No match
+
+/^(\(+)?blah(?(1)(\)))$/
+    (blah)
+ 0: (blah)
+ 1: (
+ 2: )
+    blah
+ 0: blah
+    *** Failers
+No match
+    blah)
+No match
+    (blah
+No match
+
+/(?(?!a)a|b)/
+
+/(?(?!a)b|a)/
+    a
+ 0: a
+
+/(?(?=a)b|a)/
+    *** Failers
+No match
+    a
+No match
+    a
+No match
+
+/(?(?=a)a|b)/
+    a
+ 0: a
+
+/(?=(a+?))(\1ab)/
+    aaab
+ 0: aab
+ 1: a
+ 2: aab
+
+/^(?=(a+?))\1ab/
+
+/(\w+:)+/
+    one:
+ 0: one:
+ 1: one:
+
+/$(?<=^(a))/
+    a
+ 0: 
+ 1: a
+
+/(?=(a+?))(\1ab)/
+    aaab
+ 0: aab
+ 1: a
+ 2: aab
+
+/^(?=(a+?))\1ab/
+    *** Failers
+No match
+    aaab
+No match
+    aaab
+No match
+
+/([\w:]+::)?(\w+)$/
+    abcd
+ 0: abcd
+ 1: <unset>
+ 2: abcd
+    xy:z:::abcd
+ 0: xy:z:::abcd
+ 1: xy:z:::
+ 2: abcd
+
+/^[^bcd]*(c+)/
+    aexycd
+ 0: aexyc
+ 1: c
+
+/(a*)b+/
+    caab
+ 0: aab
+ 1: aa
+
+/([\w:]+::)?(\w+)$/
+    abcd
+ 0: abcd
+ 1: <unset>
+ 2: abcd
+    xy:z:::abcd
+ 0: xy:z:::abcd
+ 1: xy:z:::
+ 2: abcd
+    *** Failers
+ 0: Failers
+ 1: <unset>
+ 2: Failers
+    abcd:
+No match
+    abcd:
+No match
+
+/^[^bcd]*(c+)/
+    aexycd
+ 0: aexyc
+ 1: c
+
+/(>a+)ab/
+
+/(?>a+)b/
+    aaab
+ 0: aaab
+
+/([[:]+)/
+    a:[b]:
+ 0: :[
+ 1: :[
+
+/([[=]+)/
+    a=[b]=
+ 0: =[
+ 1: =[
+
+/([[.]+)/
+    a.[b].
+ 0: .[
+ 1: .[
+
+/((?>a+)b)/
+    aaab
+ 0: aaab
+ 1: aaab
+
+/(?>(a+))b/
+    aaab
+ 0: aaab
+ 1: aaa
+
+/((?>[^()]+)|\([^()]*\))+/
+    ((abc(ade)ufh()()x
+ 0: abc(ade)ufh()()x
+ 1: x
+
+/a\Z/
+    *** Failers
+No match
+    aaab
+No match
+    a\nb\n
+No match
+
+/b\Z/
+    a\nb\n
+ 0: b
+
+/b\z/
+
+/b\Z/
+    a\nb
+ 0: b
+
+/b\z/
+    a\nb
+ 0: b
+    *** Failers
+No match
+    
+/^(?>(?(1)\.|())[^\W_](?>[a-z0-9-]*[^\W_])?)+$/
+    a
+ 0: a
+ 1: 
+    abc
+ 0: abc
+ 1: 
+    a-b
+ 0: a-b
+ 1: 
+    0-9 
+ 0: 0-9
+ 1: 
+    a.b
+ 0: a.b
+ 1: 
+    5.6.7  
+ 0: 5.6.7
+ 1: 
+    the.quick.brown.fox
+ 0: the.quick.brown.fox
+ 1: 
+    a100.b200.300c  
+ 0: a100.b200.300c
+ 1: 
+    12-ab.1245 
+ 0: 12-ab.1245
+ 1: 
+    *** Failers
+No match
+    \
+No match
+    .a
+No match
+    -a
+No match
+    a-
+No match
+    a.  
+No match
+    a_b 
+No match
+    a.-
+No match
+    a..  
+No match
+    ab..bc 
+No match
+    the.quick.brown.fox-
+No match
+    the.quick.brown.fox.
+No match
+    the.quick.brown.fox_
+No match
+    the.quick.brown.fox+       
+No match
+
+/(?>.*)(?<=(abcd|wxyz))/
+    alphabetabcd
+ 0: alphabetabcd
+ 1: abcd
+    endingwxyz
+ 0: endingwxyz
+ 1: wxyz
+    *** Failers
+No match
+    a rather long string that doesn't end with one of them
+No match
+
+/word (?>(?:(?!otherword)[a-zA-Z0-9]+ ){0,30})otherword/
+    word cat dog elephant mussel cow horse canary baboon snake shark otherword
+ 0: word cat dog elephant mussel cow horse canary baboon snake shark otherword
+    word cat dog elephant mussel cow horse canary baboon snake shark
+No match
+  
+/word (?>[a-zA-Z0-9]+ ){0,30}otherword/
+    word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope
+No match
+
+/(?<=\d{3}(?!999))foo/
+    999foo
+ 0: foo
+    123999foo 
+ 0: foo
+    *** Failers
+No match
+    123abcfoo
+No match
+    
+/(?<=(?!...999)\d{3})foo/
+    999foo
+ 0: foo
+    123999foo 
+ 0: foo
+    *** Failers
+No match
+    123abcfoo
+No match
+
+/(?<=\d{3}(?!999)...)foo/
+    123abcfoo
+ 0: foo
+    123456foo 
+ 0: foo
+    *** Failers
+No match
+    123999foo  
+No match
+    
+/(?<=\d{3}...)(?<!999)foo/
+    123abcfoo   
+ 0: foo
+    123456foo 
+ 0: foo
+    *** Failers
+No match
+    123999foo  
+No match
+
+/<a[\s]+href[\s]*=[\s]*          # find <a href=
+ ([\"\'])?                       # find single or double quote
+ (?(1) (.*?)\1 | ([^\s]+))       # if quote found, match up to next matching
+                                 # quote, otherwise match up to next space
+/isx
+    <a href=abcd xyz
+ 0: <a href=abcd
+ 1: <unset>
+ 2: <unset>
+ 3: abcd
+    <a href=\"abcd xyz pqr\" cats
+ 0: <a href="abcd xyz pqr"
+ 1: "
+ 2: abcd xyz pqr
+    <a href=\'abcd xyz pqr\' cats
+ 0: <a href='abcd xyz pqr'
+ 1: '
+ 2: abcd xyz pqr
+
+/<a\s+href\s*=\s*                # find <a href=
+ (["'])?                         # find single or double quote
+ (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
+                                 # quote, otherwise match up to next space
+/isx
+    <a href=abcd xyz
+ 0: <a href=abcd
+ 1: <unset>
+ 2: <unset>
+ 3: abcd
+    <a href=\"abcd xyz pqr\" cats
+ 0: <a href="abcd xyz pqr"
+ 1: "
+ 2: abcd xyz pqr
+    <a href       =       \'abcd xyz pqr\' cats
+ 0: <a href       =       'abcd xyz pqr'
+ 1: '
+ 2: abcd xyz pqr
+
+/<a\s+href(?>\s*)=(?>\s*)        # find <a href=
+ (["'])?                         # find single or double quote
+ (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
+                                 # quote, otherwise match up to next space
+/isx
+    <a href=abcd xyz
+ 0: <a href=abcd
+ 1: <unset>
+ 2: <unset>
+ 3: abcd
+    <a href=\"abcd xyz pqr\" cats
+ 0: <a href="abcd xyz pqr"
+ 1: "
+ 2: abcd xyz pqr
+    <a href       =       \'abcd xyz pqr\' cats
+ 0: <a href       =       'abcd xyz pqr'
+ 1: '
+ 2: abcd xyz pqr
+
+/((Z)+|A)*/
+    ZABCDEFG
+ 0: ZA
+ 1: A
+ 2: Z
+
+/(Z()|A)*/
+    ZABCDEFG
+ 0: ZA
+ 1: A
+ 2: 
+
+/(Z(())|A)*/
+    ZABCDEFG
+ 0: ZA
+ 1: A
+ 2: 
+ 3: 
+
+/((?>Z)+|A)*/
+    ZABCDEFG
+ 0: ZA
+ 1: A
+
+/((?>)+|A)*/
+    ZABCDEFG
+ 0: 
+ 1: 
+
+/a*/g
+    abbab
+ 0: a
+ 0: 
+ 0: 
+ 0: a
+ 0: 
+ 0: 
+
+/^[a-\d]/
+    abcde
+ 0: a
+    -things
+ 0: -
+    0digit
+ 0: 0
+    *** Failers
+No match
+    bcdef    
+No match
+
+/^[\d-a]/
+    abcde
+ 0: a
+    -things
+ 0: -
+    0digit
+ 0: 0
+    *** Failers
+No match
+    bcdef    
+No match
+    
+/[[:space:]]+/
+    > \x09\x0a\x0c\x0d\x0b<
+ 0:  \x09\x0a\x0c\x0d\x0b
+     
+/[[:blank:]]+/
+    > \x09\x0a\x0c\x0d\x0b<
+ 0:  \x09
+     
+/[\s]+/
+    > \x09\x0a\x0c\x0d\x0b<
+ 0:  \x09\x0a\x0c\x0d
+     
+/\s+/
+    > \x09\x0a\x0c\x0d\x0b<
+ 0:  \x09\x0a\x0c\x0d
+     
+/ab/x
+    ab
+No match
+
+/(?!\A)x/m
+  a\nxb\n
+ 0: x
+
+/(?!^)x/m
+  a\nxb\n
+No match
+
+/abc\Qabc\Eabc/
+    abcabcabc
+ 0: abcabcabc
+    
+/abc\Q(*+|\Eabc/
+    abc(*+|abc 
+ 0: abc(*+|abc
+
+/   abc\Q abc\Eabc/x
+    abc abcabc
+ 0: abc abcabc
+    *** Failers
+No match
+    abcabcabc  
+No match
+    
+/abc#comment
+    \Q#not comment
+    literal\E/x
+    abc#not comment\n    literal     
+ 0: abc#not comment\x0a    literal
+
+/abc#comment
+    \Q#not comment
+    literal/x
+    abc#not comment\n    literal     
+ 0: abc#not comment\x0a    literal
+
+/abc#comment
+    \Q#not comment
+    literal\E #more comment
+    /x
+    abc#not comment\n    literal     
+ 0: abc#not comment\x0a    literal
+
+/abc#comment
+    \Q#not comment
+    literal\E #more comment/x
+    abc#not comment\n    literal     
+ 0: abc#not comment\x0a    literal
+
+/\Qabc\$xyz\E/
+    abc\\\$xyz
+ 0: abc\$xyz
+
+/\Qabc\E\$\Qxyz\E/
+    abc\$xyz
+ 0: abc$xyz
+
+/\Gabc/
+    abc
+ 0: abc
+    *** Failers
+No match
+    xyzabc  
+No match
+
+/\Gabc./g
+    abc1abc2xyzabc3
+ 0: abc1
+ 0: abc2
+
+/abc./g
+    abc1abc2xyzabc3 
+ 0: abc1
+ 0: abc2
+ 0: abc3
+
+/a(?x: b c )d/
+    XabcdY
+ 0: abcd
+    *** Failers 
+No match
+    Xa b c d Y 
+No match
+
+/((?x)x y z | a b c)/
+    XabcY
+ 0: abc
+ 1: abc
+    AxyzB 
+ 0: xyz
+ 1: xyz
+
+/(?i)AB(?-i)C/
+    XabCY
+ 0: abC
+    *** Failers
+No match
+    XabcY  
+No match
+
+/((?i)AB(?-i)C|D)E/
+    abCE
+ 0: abCE
+ 1: abC
+    DE
+ 0: DE
+ 1: D
+    *** Failers
+No match
+    abcE
+No match
+    abCe  
+No match
+    dE
+No match
+    De    
+No match
+
+/(.*)\d+\1/
+    abc123abc
+ 0: abc123abc
+ 1: abc
+    abc123bc 
+ 0: bc123bc
+ 1: bc
+
+/(.*)\d+\1/s
+    abc123abc
+ 0: abc123abc
+ 1: abc
+    abc123bc 
+ 0: bc123bc
+ 1: bc
+    
+/((.*))\d+\1/
+    abc123abc
+ 0: abc123abc
+ 1: abc
+ 2: abc
+    abc123bc  
+ 0: bc123bc
+ 1: bc
+ 2: bc
+
+/-- This tests for an IPv6 address in the form where it can have up to --/
+/-- eight components, one and only one of which is empty. This must be --/
+No match
+/-- an internal component. --/
+No match
+
+/^(?!:)                       # colon disallowed at start
+  (?:                         # start of item
+    (?: [0-9a-f]{1,4} |       # 1-4 hex digits or
+    (?(1)0 | () ) )           # if null previously matched, fail; else null
+    :                         # followed by colon
+  ){1,7}                      # end item; 1-7 of them required               
+  [0-9a-f]{1,4} $             # final hex number at end of string
+  (?(1)|.)                    # check that there was an empty component
+  /xi
+    a123::a123
+ 0: a123::a123
+ 1: 
+    a123:b342::abcd
+ 0: a123:b342::abcd
+ 1: 
+    a123:b342::324e:abcd
+ 0: a123:b342::324e:abcd
+ 1: 
+    a123:ddde:b342::324e:abcd
+ 0: a123:ddde:b342::324e:abcd
+ 1: 
+    a123:ddde:b342::324e:dcba:abcd
+ 0: a123:ddde:b342::324e:dcba:abcd
+ 1: 
+    a123:ddde:9999:b342::324e:dcba:abcd
+ 0: a123:ddde:9999:b342::324e:dcba:abcd
+ 1: 
+    *** Failers
+No match
+    1:2:3:4:5:6:7:8
+No match
+    a123:bce:ddde:9999:b342::324e:dcba:abcd
+No match
+    a123::9999:b342::324e:dcba:abcd
+No match
+    abcde:2:3:4:5:6:7:8
+No match
+    ::1
+No match
+    abcd:fee0:123::   
+No match
+    :1
+No match
+    1:  
+No match
+
+/[z\Qa-d]\E]/
+    z
+ 0: z
+    a
+ 0: a
+    -
+ 0: -
+    d
+ 0: d
+    ] 
+ 0: ]
+    *** Failers
+ 0: a
+    b     
+No match
+
+/[\z\C]/
+    z
+ 0: z
+    C 
+ 0: C
+    
+/\M/
+    M 
+ 0: M
+    
 / End of testinput1 /
 
diff --git a/testdata/testoutput2 b/testdata/testoutput2
index e8844d2..3f38522 100644
--- a/testdata/testoutput2
+++ b/testdata/testoutput2
@@ -1,4 +1,4 @@
-PCRE version 3.9 02-Jan-2002
+PCRE version 4.0 17-Feb-2003
 
 /(a)b|/
 Capturing subpattern count = 1
@@ -91,8 +91,8 @@ Failed: number too big in {} quantifier at offset 7
 /[abcd/
 Failed: missing terminating ] for character class at offset 5
 
-/[\B]/
-Failed: invalid escape sequence in character class at offset 2
+/(?X)[\B]/
+Failed: invalid escape sequence in character class at offset 6
 
 /[z-a]/
 Failed: range out of order in character class at offset 3
@@ -136,6 +136,7 @@ Capturing subpattern count = 0
 No options
 No first char
 No need char
+Study size = 40
 Starting character set: c d e 
     this sentence eventually mentions a cat
  0: cat
@@ -147,6 +148,7 @@ Capturing subpattern count = 0
 Options: caseless
 No first char
 No need char
+Study size = 40
 Starting character set: C D E c d e 
     this sentence eventually mentions a CAT cat
  0: CAT
@@ -158,6 +160,7 @@ Capturing subpattern count = 0
 No options
 No first char
 No need char
+Study size = 40
 Starting character set: a b c d 
 
 /(a|[^\dZ])/S
@@ -165,6 +168,7 @@ Capturing subpattern count = 1
 No options
 No first char
 No need char
+Study size = 40
 Starting character set: \x00 \x01 \x02 \x03 \x04 \x05 \x06 \x07 \x08 \x09 \x0a 
   \x0b \x0c \x0d \x0e \x0f \x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17 \x18 \x19 
   \x1a \x1b \x1c \x1d \x1e \x1f \x20 ! " # $ % & ' ( ) * + , - . / : ; < = > 
@@ -185,10 +189,11 @@ Capturing subpattern count = 1
 No options
 No first char
 No need char
-Starting character set: \x09 \x0a \x0b \x0c \x0d \x20 a b 
+Study size = 40
+Starting character set: \x09 \x0a \x0c \x0d \x20 a b 
 
 /(ab\2)/
-Failed: back reference to non-existent subpattern at offset 6
+Failed: reference to non-existent subpattern at offset 6
 
 /{4,5}abc/
 Failed: nothing to repeat at offset 4
@@ -281,7 +286,7 @@ No match
 No match
 
 /(a)(b)(c)(d)(e)\6/
-Failed: back reference to non-existent subpattern at offset 17
+Failed: reference to non-existent subpattern at offset 17
 
 /the quick brown fox/
 Capturing subpattern count = 0
@@ -426,7 +431,7 @@ Need char = '>'
     abc<def>ghi<klm>nop
  0: <def>
     
-/<.*>(?U)/
+/(?U)<.*>/
 Capturing subpattern count = 0
 Options: ungreedy
 First char = '<'
@@ -486,8 +491,8 @@ Failed: lookbehind assertion is not fixed length at offset 12
 /(?i)abc/
 Capturing subpattern count = 0
 Options: caseless
-First char = 'a'
-Need char = 'c'
+First char = 'a' (caseless)
+Need char = 'c' (caseless)
 
 /(a|(?m)a)/
 Capturing subpattern count = 1
@@ -519,6 +524,7 @@ Capturing subpattern count = 0
 No options
 No first char
 No need char
+Study size = 40
 Starting character set: a b c d 
 
 /(?i)[abcd]/S
@@ -526,6 +532,7 @@ Capturing subpattern count = 0
 Options: caseless
 No first char
 No need char
+Study size = 40
 Starting character set: A B C D a b c d 
 
 /(?m)[xy]|(b|c)/S
@@ -533,6 +540,7 @@ Capturing subpattern count = 1
 Options: multiline
 No first char
 No need char
+Study size = 40
 Starting character set: b c x y 
 
 /(^a|^b)/m
@@ -563,7 +571,7 @@ Failed: assertion expected after (?( at offset 3
 Failed: assertion expected after (?( at offset 3
 
 /(?(?<ab))/
-Failed: unrecognized character after (?< at offset 2
+Failed: unrecognized character after (?< at offset 5
 
 /((?s)blah)\s+\1/
 Capturing subpattern count = 1
@@ -577,8 +585,8 @@ Capturing subpattern count = 1
 Max back reference = 1
 No options
 Case state changes
-No first char
-Need char = 'h'
+First char = 'b' (caseless)
+Need char = 'h' (caseless)
 
 /((?i)b)/DS
 ------------------------------------------------------------------
@@ -594,9 +602,9 @@ Need char = 'h'
 Capturing subpattern count = 1
 No options
 Case state changes
-No first char
-Need char = 'b'
-Starting character set: B b 
+First char = 'b' (caseless)
+No need char
+Study returned NULL
 
 /(a*b|(?i:c*(?-i)d))/S
 Capturing subpattern count = 1
@@ -604,6 +612,7 @@ No options
 Case state changes
 No first char
 No need char
+Study size = 40
 Starting character set: C a b c d 
 
 /a$/
@@ -668,6 +677,7 @@ Capturing subpattern count = 0
 No options
 No first char
 No need char
+Study size = 40
 Starting character set: a b 
 
 /(?<!foo)(alpha|omega)/S
@@ -675,6 +685,7 @@ Capturing subpattern count = 1
 No options
 No first char
 Need char = 'a'
+Study size = 40
 Starting character set: a o 
 
 /(?!alphabet)[ab]/S
@@ -682,6 +693,7 @@ Capturing subpattern count = 0
 No options
 No first char
 No need char
+Study size = 40
 Starting character set: a b 
 
 /(?<=foo\n)^bar/m
@@ -864,13 +876,13 @@ Failed: nothing to repeat at offset 2
 Failed: unmatched parentheses at offset 0
 
 /\1/
-Failed: back reference to non-existent subpattern at offset 2
+Failed: reference to non-existent subpattern at offset 2
 
 /\2/
-Failed: back reference to non-existent subpattern at offset 2
+Failed: reference to non-existent subpattern at offset 2
 
 /(a)|\2/
-Failed: back reference to non-existent subpattern at offset 6
+Failed: reference to non-existent subpattern at offset 6
 
 /a[b-a]/i
 Failed: range out of order in character class at offset 4
@@ -903,7 +915,7 @@ Failed: unmatched parentheses at offset 0
 Failed: missing ) at offset 4
 
 /(?<%)b/
-Failed: unrecognized character after (?< at offset 0
+Failed: unrecognized character after (?< at offset 3
 
 /a(?{)b/
 Failed: unrecognized character after (? at offset 3
@@ -1483,7 +1495,7 @@ Need char = 'a'
 Capturing subpattern count = 0
 No options
 First char = 'a'
-No need char
+Need char = 'a'
 
 /(?=a)a.*/
 Capturing subpattern count = 0
@@ -1787,7 +1799,7 @@ Need char = ')'
  0: (abcd(xyz<p>qrs)123)
  1: abcd(xyz<p>qrs)123
  2: 123
- 3: <p>qrs
+ 3: <unset>
 
 /\( ( ( (?>[^()]+) | ((?R)) )* ) \) /x
 Capturing subpattern count = 3
@@ -1844,6 +1856,19 @@ Options: anchored
 No first char
 No need char
 
+/^[[:blank:]]/D
+------------------------------------------------------------------
+  0  37 Bra 0
+  3     ^
+  4     [\x09 ]
+ 37  37 Ket
+ 40     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: anchored
+No first char
+No need char
+
 /^[[:cntrl:]]/D
 ------------------------------------------------------------------
   0  37 Bra 0
@@ -2000,6 +2025,19 @@ Options: anchored
 No first char
 No need char
 
+/^[[:^blank:]]/D
+------------------------------------------------------------------
+  0  37 Bra 0
+  3     ^
+  4     [\x00-\x08\x0a-\x1f!-\xff]
+ 37  37 Ket
+ 40     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: anchored
+No first char
+No need char
+
 /[01[:alpha:]%]/D
 ------------------------------------------------------------------
   0  36 Bra 0
@@ -2372,6 +2410,2004 @@ Need char = 'n'
  1: main
  2: O
     
+/These are all cases where Perl does it differently (nested captures)/
+Capturing subpattern count = 1
+No options
+First char = 'T'
+Need char = 's'
+
+/^(a(b)?)+$/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = 'a'
+    aba
+ 0: aba
+ 1: a
+ 2: b
+   
+/^(aa(bb)?)+$/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: aa
+ 2: bb
+    
+/^(aa|aa(bb))+$/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa 
+ 0: aabbaa
+ 1: aa
+ 2: bb
+    
+/^(aa(bb)??)+$/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: aa
+ 2: bb
+    
+/^(?:aa(bb)?)+$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: bb
+    
+/^(aa(b(b))?)+$/
+Capturing subpattern count = 3
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: aa
+ 2: bb
+ 3: b
+
+/^(?:aa(b(b))?)+$/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: bb
+ 2: b
+
+/^(?:aa(b(?:b))?)+$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: bb
+
+/^(?:aa(bb(?:b))?)+$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'a'
+    aabbbaa    
+ 0: aabbbaa
+ 1: bbb
+    
+/^(?:aa(b(?:bb))?)+$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'a'
+    aabbbaa    
+ 0: aabbbaa
+ 1: bbb
+
+/^(?:aa(?:b(b))?)+$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'a'
+    aabbaa    
+ 0: aabbaa
+ 1: b
+
+/^(?:aa(?:b(bb))?)+$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'a'
+    aabbbaa    
+ 0: aabbbaa
+ 1: bb
+
+/^(aa(b(bb))?)+$/
+Capturing subpattern count = 3
+Options: anchored
+No first char
+Need char = 'a'
+    aabbbaa    
+ 0: aabbbaa
+ 1: aa
+ 2: bbb
+ 3: bb
+
+/^(aa(bb(bb))?)+$/
+Capturing subpattern count = 3
+Options: anchored
+No first char
+Need char = 'a'
+    aabbbbaa    
+ 0: aabbbbaa
+ 1: aa
+ 2: bbbb
+ 3: bb
+
+/--------------------------------------------------------------------/ 
+Capturing subpattern count = 0
+No options
+First char = '-'
+Need char = '-'
+    
+/#/xMD
+Memory allocation (code space): 7
+------------------------------------------------------------------
+  0   3 Bra 0
+  3   3 Ket
+  6     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: extended
+No first char
+No need char
+
+/a#/xMD
+Memory allocation (code space): 13
+------------------------------------------------------------------
+  0   6 Bra 0
+  3   1 a
+  6   6 Ket
+  9     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: extended
+First char = 'a'
+No need char
+
+/[\s]/D
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x09-\x0a\x0c-\x0d ]
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/[\S]/D
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x00-\x08\x0b\x0e-\x1f!-\xff]
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/a(?i)b/D
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   1 a
+  6  01 Opt
+  8   1 b
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+Case state changes
+First char = 'a'
+Need char = 'b' (caseless)
+    ab
+ 0: ab
+    aB
+ 0: aB
+    *** Failers 
+No match
+    AB  
+No match
+
+/(a(?i)b)/D
+------------------------------------------------------------------
+  0  19 Bra 0
+  3  11 Bra 1
+  6   1 a
+  9  01 Opt
+ 11   1 b
+ 14  11 Ket
+ 17  00 Opt
+ 19  19 Ket
+ 22     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+No options
+Case state changes
+First char = 'a'
+Need char = 'b' (caseless)
+    ab
+ 0: ab
+ 1: ab
+    aB
+ 0: aB
+ 1: aB
+    *** Failers 
+No match
+    AB  
+No match
+    
+/   (?i)abc/xD
+------------------------------------------------------------------
+  0   8 Bra 0
+  3   3 abc
+  8   8 Ket
+ 11     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: caseless extended
+First char = 'a' (caseless)
+Need char = 'c' (caseless)
+
+/#this is a comment
+  (?i)abc/xD
+------------------------------------------------------------------
+  0   8 Bra 0
+  3   3 abc
+  8   8 Ket
+ 11     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: caseless extended
+First char = 'a' (caseless)
+Need char = 'c' (caseless)
+
+/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/D
+------------------------------------------------------------------
+  0 307 Bra 0
+  3 250 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
+255  50 12345678901234567890123456789012345678901234567890
+307 307 Ket
+310     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = '1'
+Need char = '0'
+
+/\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/D
+------------------------------------------------------------------
+  0 307 Bra 0
+  3 250 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
+255  50 12345678901234567890123456789012345678901234567890
+307 307 Ket
+310     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = '1'
+Need char = '0'
+
+/\Q\E/D
+------------------------------------------------------------------
+  0   3 Bra 0
+  3   3 Ket
+  6     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+    \
+ 0: 
+
+/\Q\Ex/D
+------------------------------------------------------------------
+  0   6 Bra 0
+  3   1 x
+  6   6 Ket
+  9     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'x'
+No need char
+
+/ \Q\E/D
+------------------------------------------------------------------
+  0   6 Bra 0
+  3   1  
+  6   6 Ket
+  9     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = ' '
+No need char
+
+/a\Q\E/D
+------------------------------------------------------------------
+  0   6 Bra 0
+  3   1 a
+  6   6 Ket
+  9     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'a'
+No need char
+  abc
+ 0: a
+  bca
+ 0: a
+  bac  
+ 0: a
+
+/a\Q\Eb/D
+------------------------------------------------------------------
+  0   9 Bra 0
+  3   1 a
+  6   1 b
+  9   9 Ket
+ 12     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'b'
+  abc
+ 0: ab
+
+/\Q\Eabc/D
+------------------------------------------------------------------
+  0   8 Bra 0
+  3   3 abc
+  8   8 Ket
+ 11     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'c'
+
+/x*+\w/D
+------------------------------------------------------------------
+  0  12 Bra 0
+  3   5 Once
+  6     x*
+  8   5 Ket
+ 11     \w
+ 12  12 Ket
+ 15     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+    *** Failers
+ 0: F
+    xxxxx
+No match
+    
+/x?+/D
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   5 Once
+  6     x?
+  8   5 Ket
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/x++/D
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   5 Once
+  6     x+
+  8   5 Ket
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'x'
+No need char
+
+/x{1,3}+/D 
+------------------------------------------------------------------
+  0  16 Bra 0
+  3  10 Once
+  6   1 x
+  9     x{,2}
+ 13  10 Ket
+ 16  16 Ket
+ 19     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'x'
+No need char
+
+/(x)*+/D
+------------------------------------------------------------------
+  0  19 Bra 0
+  3  13 Once
+  6     Brazero
+  7   6 Bra 1
+ 10   1 x
+ 13   6 KetRmax
+ 16  13 Ket
+ 19  19 Ket
+ 22     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+No options
+No first char
+No need char
+
+/^(\w++|\s++)*$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+No need char
+    now is the time for all good men to come to the aid of the party
+ 0: now is the time for all good men to come to the aid of the party
+ 1: party
+    *** Failers
+No match
+    this is not a line with only words and spaces!
+No match
+    
+/(\d++)(\w)/
+Capturing subpattern count = 2
+No options
+No first char
+No need char
+    12345a
+ 0: 12345a
+ 1: 12345
+ 2: a
+    *** Failers
+No match
+    12345+ 
+No match
+
+/a++b/
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'b'
+    aaab
+ 0: aaab
+
+/(a++b)/
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'b'
+    aaab
+ 0: aaab
+ 1: aaab
+
+/(a++)b/
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'b'
+    aaab
+ 0: aaab
+ 1: aaa
+
+/([^()]++|\([^()]*\))+/
+Capturing subpattern count = 1
+No options
+No first char
+No need char
+    ((abc(ade)ufh()()x
+ 0: abc(ade)ufh()()x
+ 1: x
+    
+/\(([^()]++|\([^()]+\))+\)/ 
+Capturing subpattern count = 1
+No options
+First char = '('
+Need char = ')'
+    (abc)
+ 0: (abc)
+ 1: abc
+    (abc(def)xyz)
+ 0: (abc(def)xyz)
+ 1: xyz
+    *** Failers
+No match
+    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
+No match
+
+/(abc){1,3}+/D
+------------------------------------------------------------------
+  0  50 Bra 0
+  3  44 Once
+  6   8 Bra 1
+  9   3 abc
+ 14   8 Ket
+ 17     Brazero
+ 18  26 Bra 0
+ 21   8 Bra 1
+ 24   3 abc
+ 29   8 Ket
+ 32     Brazero
+ 33   8 Bra 1
+ 36   3 abc
+ 41   8 Ket
+ 44  26 Ket
+ 47  44 Ket
+ 50  50 Ket
+ 53     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'c'
+
+/a+?+/
+Failed: nothing to repeat at offset 3
+
+/a{2,3}?+b/
+Failed: nothing to repeat at offset 7
+
+/(?U)a+?+/
+Failed: nothing to repeat at offset 7
+
+/a{2,3}?+b/U
+Failed: nothing to repeat at offset 7
+
+/x(?U)a++b/D
+------------------------------------------------------------------
+  0  17 Bra 0
+  3   1 x
+  6   5 Once
+  9     a+
+ 11   5 Ket
+ 14   1 b
+ 17  17 Ket
+ 20     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = 'x'
+Need char = 'b'
+    xaaaab
+ 0: xaaaab
+
+/(?U)xa++b/D
+------------------------------------------------------------------
+  0  17 Bra 0
+  3   1 x
+  6   5 Once
+  9     a+
+ 11   5 Ket
+ 14   1 b
+ 17  17 Ket
+ 20     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: ungreedy
+First char = 'x'
+Need char = 'b'
+    xaaaab
+ 0: xaaaab
+
+/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/D
+------------------------------------------------------------------
+  0 106 Bra 0
+  3     ^
+  4  99 Bra 1
+  7   5 Bra 2
+ 10     a+
+ 12   5 Ket
+ 15  37 Bra 3
+ 18     [a-b]+?
+ 52  37 Ket
+ 55  37 Bra 4
+ 58     [b-c]+
+ 92  37 Ket
+ 95   5 Bra 5
+ 98     \w*
+100   5 Ket
+103  99 Ket
+106 106 Ket
+109     End
+------------------------------------------------------------------
+Capturing subpattern count = 5
+Options: anchored
+No first char
+Need char = 'a'
+
+/^x(?U)a+b/D
+------------------------------------------------------------------
+  0  12 Bra 0
+  3     ^
+  4   1 x
+  7     a+?
+  9   1 b
+ 12  12 Ket
+ 15     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: anchored
+No first char
+Need char = 'b'
+
+/^x(?U)(a+)b/D
+------------------------------------------------------------------
+  0  18 Bra 0
+  3     ^
+  4   1 x
+  7   5 Bra 1
+ 10     a+?
+ 12   5 Ket
+ 15   1 b
+ 18  18 Ket
+ 21     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'b'
+
+/[.x.]/
+Failed: POSIX collating elements are not supported at offset 0
+
+/[=x=]/
+Failed: POSIX collating elements are not supported at offset 0
+
+/[:x:]/
+Failed: POSIX named classes are supported only within a class at offset 0
+
+/\l/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\L/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\N{name}/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\pP/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\PP/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\p{prop}/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\P{prop}/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\u/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\U/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/\X/
+Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
+
+/[/
+Failed: missing terminating ] for character class at offset 1
+
+/[a-/
+Failed: missing terminating ] for character class at offset 3
+
+/[[:space:]/
+Failed: missing terminating ] for character class at offset 10
+
+/[\s]/DM
+Memory allocation (code space): 40
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x09-\x0a\x0c-\x0d ]
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/[[:space:]]/DM
+Memory allocation (code space): 40
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x09-\x0d ]
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/[[:space:]abcde]/DM
+Memory allocation (code space): 40
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x09-\x0d a-e]
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/< (?: (?(R) \d++  | [^<>]*+) | (?R)) * >/x
+Capturing subpattern count = 0
+Options: extended
+First char = '<'
+Need char = '>'
+    <>
+ 0: <>
+    <abcd>
+ 0: <abcd>
+    <abc <123> hij>
+ 0: <abc <123> hij>
+    <abc <def> hij>
+ 0: <def>
+    <abc<>def> 
+ 0: <abc<>def>
+    <abc<>      
+ 0: <>
+    *** Failers
+No match
+    <abc
+No match
+
+|8J\$WE\<\.rX\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|DM
+Memory allocation (code space): 421
+------------------------------------------------------------------
+  0 417 Bra 0
+  3 250 8J$WE<.rX+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$M^Mss_U/]&LK9[5vQub^w[KDD<EjmhUZ?.akp2dF>qmj;2}YWFdYx.Ap]hjCPTP(n28k+3;o&WXqs/gOXdr$:r'do0;b4c(f_Gr="\4)[01T7ajQJvL$W~mL_sS/4h:x*[ZN=KLs&L5zX//>it,o:aU(;Z>pW&T7oP'2K^E:
+255 159 x9'c[%z-,64JQ5AeH_G#KijUKghQw^\vea3a?kka_G$8#`*kynsxzBLru']k_[7FrVx}^=$blx>s-N%j;D*aZDnsw:YKZ%Q.Kne9#hP?+b3(SOvL,^;&u5@?5C5Bhb=m-vEh_L15Jl]U)0RP6{q%L^_z5E'Dw6X
+416     \b
+417 417 Ket
+420     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = '8'
+Need char = 'X'
+
+|\$\<\.X\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|DM
+Memory allocation (code space): 416
+------------------------------------------------------------------
+  0 412 Bra 0
+  3 250 $<.X+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$M^Mss_U/]&LK9[5vQub^w[KDD<EjmhUZ?.akp2dF>qmj;2}YWFdYx.Ap]hjCPTP(n28k+3;o&WXqs/gOXdr$:r'do0;b4c(f_Gr="\4)[01T7ajQJvL$W~mL_sS/4h:x*[ZN=KLs&L5zX//>it,o:aU(;Z>pW&T7oP'2K^E:x9'c[
+255 154 %z-,64JQ5AeH_G#KijUKghQw^\vea3a?kka_G$8#`*kynsxzBLru']k_[7FrVx}^=$blx>s-N%j;D*aZDnsw:YKZ%Q.Kne9#hP?+b3(SOvL,^;&u5@?5C5Bhb=m-vEh_L15Jl]U)0RP6{q%L^_z5E'Dw6X
+411     \b
+412 412 Ket
+415     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+First char = '$'
+Need char = 'X'
+
+/(.*)\d+\1/I
+Capturing subpattern count = 1
+Max back reference = 1
+No options
+No first char
+No need char
+
+/(.*)\d+/I
+Capturing subpattern count = 1
+No options
+First char at start or follows \n
+No need char
+    
+/(.*)\d+\1/Is
+Capturing subpattern count = 1
+Max back reference = 1
+Options: dotall
+No first char
+No need char
+
+/(.*)\d+/Is
+Capturing subpattern count = 1
+Options: anchored dotall
+No first char
+No need char
+
+/(.*(xyz))\d+\2/I
+Capturing subpattern count = 2
+Max back reference = 2
+No options
+First char at start or follows \n
+Need char = 'z'
+
+/((.*))\d+\1/I
+Capturing subpattern count = 2
+Max back reference = 1
+No options
+No first char
+No need char
+    abc123bc
+ 0: bc123bc
+ 1: bc
+ 2: bc
+    
+/a[b]/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'b'
+
+/(?=a).*/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+No need char
+
+/(?=abc).xyz/iI
+Capturing subpattern count = 0
+Options: caseless
+First char = 'a' (caseless)
+Need char = 'z' (caseless)
+
+/(?=abc)(?i).xyz/I
+Capturing subpattern count = 0
+No options
+Case state changes
+First char = 'a'
+Need char = 'z' (caseless)
+
+/(?=a)(?=b)/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+No need char
+
+/(?=.)a/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+No need char
+
+/((?=abcda)a)/I
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'a'
+
+/((?=abcda)ab)/I
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'b'
+
+/()a/I
+Capturing subpattern count = 1
+No options
+No first char
+Need char = 'a'
+
+/(?(1)ab|ac)/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+No need char
+
+/(?(1)abz|acz)/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'z'
+
+/(?(1)abz)/I
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/(?(1)abz)123/I
+Capturing subpattern count = 0
+No options
+No first char
+Need char = '3'
+
+/(a)+/I
+Capturing subpattern count = 1
+No options
+First char = 'a'
+No need char
+
+/(a){2,3}/I
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'a'
+
+/(a)*/I
+Capturing subpattern count = 1
+No options
+No first char
+No need char
+
+/[a]/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+No need char
+
+/[ab]/I
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/[ab]/IS
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+Study size = 40
+Starting character set: a b 
+
+/[^a]/I
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/\d456/I
+Capturing subpattern count = 0
+No options
+No first char
+Need char = '6'
+
+/\d456/IS
+Capturing subpattern count = 0
+No options
+No first char
+Need char = '6'
+Study size = 40
+Starting character set: 0 1 2 3 4 5 6 7 8 9 
+
+/a^b/I
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'b'
+
+/^a/mI
+Capturing subpattern count = 0
+Options: multiline
+First char at start or follows \n
+Need char = 'a'
+  abcde
+ 0: a
+  xy\nabc 
+ 0: a
+  *** Failers 
+No match
+  xyabc 
+No match
+
+/c|abc/I
+Capturing subpattern count = 0
+No options
+No first char
+Need char = 'c'
+
+/(?i)[ab]/IS
+Capturing subpattern count = 0
+Options: caseless
+No first char
+No need char
+Study size = 40
+Starting character set: A B a b 
+
+/[ab](?i)cd/IS
+Capturing subpattern count = 0
+No options
+Case state changes
+No first char
+Need char = 'd' (caseless)
+Study size = 40
+Starting character set: a b 
+
+/abc(?C)def/
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'f'
+    abcdef
+--->abcdef
+  0 ^  ^
+ 0: abcdef
+    1234abcdef 
+--->1234abcdef
+  0     ^  ^
+ 0: abcdef
+    *** Failers
+No match
+    abcxyz
+No match
+    abcxyzf   
+--->abcxyzf
+  0 ^  ^
+No match
+
+/abc(?C)de(?C1)f/
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'f'
+    123abcdef
+--->123abcdef
+  0    ^  ^
+  1    ^    ^
+ 0: abcdef
+    
+/(?C1)\dabc(?C2)def/ 
+Capturing subpattern count = 0
+No options
+No first char
+Need char = 'f'
+    1234abcdef
+--->1234abcdef
+  1 ^
+  1  ^
+  1   ^
+  1    ^
+  2    ^   ^
+ 0: 4abcdef
+    *** Failers
+No match
+    abcdef 
+--->abcdef
+  1 ^
+  1  ^
+  1   ^
+  1    ^
+  1     ^
+  1      ^
+No match
+    
+/(?C255)ab/
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'b'
+
+/(?C256)ab/
+Failed: number after (?C is > 255 at offset 6
+
+/(?Cab)xx/ 
+Failed: closing ) for (?C expected at offset 3
+
+/(?C12vr)x/
+Failed: closing ) for (?C expected at offset 5
+
+/abc(?C)def/
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'f'
+    *** Failers
+No match
+    \x83\x0\x61bcdef
+--->\x83\x00abcdef
+  0         ^  ^
+ 0: abcdef
+
+/(abc)(?C)de(?C1)f/
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'f'
+    123abcdef
+--->123abcdef
+  0    ^  ^
+  1    ^    ^
+ 0: abcdef
+ 1: abc
+    123abcdef\C+ 
+Callout 0: last capture = 1
+ 0: <unset>
+ 1: abc
+--->123abcdef
+       ^  ^
+Callout 1: last capture = 1
+ 0: <unset>
+ 1: abc
+--->123abcdef
+       ^    ^
+ 0: abcdef
+ 1: abc
+    123abcdef\C- 
+ 0: abcdef
+ 1: abc
+    *** Failers
+No match
+    123abcdef\C!1 
+--->123abcdef
+  0    ^  ^
+  1    ^    ^
+No match
+    
+/(?C0)(abc(?C1))*/
+Capturing subpattern count = 1
+No options
+No first char
+No need char
+    abcabcabc
+--->abcabcabc
+  0 ^
+  1 ^  ^
+  1 ^     ^
+  1 ^        ^
+ 0: abcabcabc
+ 1: abc
+    abcabc\C!1!3   
+--->abcabc
+  0 ^
+  1 ^  ^
+  1 ^     ^
+ 0: abcabc
+ 1: abc
+    *** Failers
+--->*** Failers
+  0 ^
+ 0: 
+    abcabcabc\C!1!3   
+--->abcabcabc
+  0 ^
+  1 ^  ^
+  1 ^     ^
+  1 ^        ^
+ 0: abcabc
+ 1: abc
+
+/(\d{3}(?C))*/
+Capturing subpattern count = 1
+No options
+No first char
+No need char
+    123\C+
+Callout 0: last capture = -1
+ 0: <unset>
+--->123
+    ^  ^
+ 0: 123
+ 1: 123
+    123456\C+
+Callout 0: last capture = -1
+ 0: <unset>
+--->123456
+    ^  ^
+Callout 0: last capture = 1
+ 0: <unset>
+ 1: 123
+--->123456
+    ^     ^
+ 0: 123456
+ 1: 456
+    123456789\C+  
+Callout 0: last capture = -1
+ 0: <unset>
+--->123456789
+    ^  ^
+Callout 0: last capture = 1
+ 0: <unset>
+ 1: 123
+--->123456789
+    ^     ^
+Callout 0: last capture = 1
+ 0: <unset>
+ 1: 456
+--->123456789
+    ^        ^
+ 0: 123456789
+ 1: 789
+
+/((xyz)(?C)p|(?C1)xyzabc)/
+Capturing subpattern count = 2
+No options
+First char = 'x'
+No need char
+    xyzabc\C+
+Callout 0: last capture = 2
+ 0: <unset>
+ 1: <unset>
+ 2: xyz
+--->xyzabc
+    ^  ^
+Callout 1: last capture = -1
+ 0: <unset>
+--->xyzabc
+    ^
+ 0: xyzabc
+ 1: xyzabc
+
+/(X)((xyz)(?C)p|(?C1)xyzabc)/
+Capturing subpattern count = 3
+No options
+First char = 'X'
+Need char = 'x'
+    Xxyzabc\C+
+Callout 0: last capture = 3
+ 0: <unset>
+ 1: X
+ 2: <unset>
+ 3: xyz
+--->Xxyzabc
+    ^   ^
+Callout 1: last capture = 1
+ 0: <unset>
+ 1: X
+--->Xxyzabc
+    ^^
+ 0: Xxyzabc
+ 1: X
+ 2: xyzabc
+
+/(?=(abc))(?C)abcdef/
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'f'
+    abcdef\C+
+Callout 0: last capture = 1
+ 0: <unset>
+ 1: abc
+--->abcdef
+    ^
+ 0: abcdef
+ 1: abc
+    
+/(?!(abc)(?C1)d)(?C2)abcxyz/
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'z'
+    abcxyz\C+ 
+Callout 1: last capture = 1
+ 0: <unset>
+ 1: abc
+--->abcxyz
+    ^  ^
+Callout 2: last capture = -1
+ 0: <unset>
+--->abcxyz
+    ^
+ 0: abcxyz
+
+/(?<=(abc)(?C))xyz/
+Capturing subpattern count = 1
+No options
+First char = 'x'
+Need char = 'z'
+   abcxyz\C+
+Callout 0: last capture = 1
+ 0: <unset>
+ 1: abc
+--->abcxyz
+       ^
+ 0: xyz
+ 1: abc
+   
+/(?C)abc/ 
+Capturing subpattern count = 0
+No options
+First char = 'a'
+Need char = 'c'
+
+/(?C)^abc/
+Capturing subpattern count = 0
+Options: anchored
+No first char
+Need char = 'c'
+
+/(?C)a|b/S
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+Study size = 40
+Starting character set: a b 
+
+/(?R)/
+Failed: recursive call could loop indefinitely at offset 3
+
+/(a|(?R))/
+Failed: recursive call could loop indefinitely at offset 6
+
+/(ab|(bc|(de|(?R))))/
+Failed: recursive call could loop indefinitely at offset 15
+
+/x(ab|(bc|(de|(?R))))/
+Capturing subpattern count = 3
+No options
+First char = 'x'
+No need char
+    xab
+ 0: xab
+ 1: ab
+    xbc
+ 0: xbc
+ 1: bc
+ 2: bc
+    xde
+ 0: xde
+ 1: de
+ 2: de
+ 3: de
+    xxab
+ 0: xxab
+ 1: xab
+ 2: xab
+ 3: xab
+    xxxab
+ 0: xxxab
+ 1: xxab
+ 2: xxab
+ 3: xxab
+    *** Failers
+No match
+    xyab   
+No match
+
+/(ab|(bc|(de|(?1))))/
+Failed: recursive call could loop indefinitely at offset 15
+
+/x(ab|(bc|(de|(?1)x)x)x)/
+Failed: recursive call could loop indefinitely at offset 16
+
+/^([^()]|\((?1)*\))*$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+No need char
+    abc
+ 0: abc
+ 1: c
+    a(b)c
+ 0: a(b)c
+ 1: c
+    a(b(c))d  
+ 0: a(b(c))d
+ 1: d
+    *** Failers)
+No match
+    a(b(c)d  
+No match
+
+/^>abc>([^()]|\((?1)*\))*<xyz<$/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = '<'
+   >abc>123<xyz<
+ 0: >abc>123<xyz<
+ 1: 3
+   >abc>1(2)3<xyz<
+ 0: >abc>1(2)3<xyz<
+ 1: 3
+   >abc>(1(2)3)<xyz<
+ 0: >abc>(1(2)3)<xyz<
+ 1: (1(2)3)
+
+/(a(?1)b)/D
+------------------------------------------------------------------
+  0  18 Bra 0
+  3  12 Bra 1
+  6   1 a
+  9   3 Recurse
+ 12   1 b
+ 15  12 Ket
+ 18  18 Ket
+ 21     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'b'
+
+/(a(?1)+b)/D
+------------------------------------------------------------------
+  0  24 Bra 0
+  3  18 Bra 1
+  6   1 a
+  9   6 Bra 0
+ 12   3 Recurse
+ 15   6 KetRmax
+ 18   1 b
+ 21  18 Ket
+ 24  24 Ket
+ 27     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'b'
+
+/^\W*(?:((.)\W*(?1)\W*\2|)|((.)\W*(?3)\W*\4|\W*.\W*))\W*$/i
+Capturing subpattern count = 4
+Max back reference = 4
+Options: anchored caseless
+No first char
+No need char
+    1221
+ 0: 1221
+ 1: 1221
+ 2: 1
+    Satan, oscillate my metallic sonatas!
+ 0: Satan, oscillate my metallic sonatas!
+ 1: <unset>
+ 2: <unset>
+ 3: Satan, oscillate my metallic sonatas
+ 4: S
+    A man, a plan, a canal: Panama!
+ 0: A man, a plan, a canal: Panama!
+ 1: <unset>
+ 2: <unset>
+ 3: A man, a plan, a canal: Panama
+ 4: A
+    Able was I ere I saw Elba. 
+ 0: Able was I ere I saw Elba.
+ 1: <unset>
+ 2: <unset>
+ 3: Able was I ere I saw Elba
+ 4: A
+    *** Failers
+No match
+    The quick brown fox  
+No match
+    
+/^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+No need char
+    12
+ 0: 12
+ 1: 12
+    (((2+2)*-3)-7)
+ 0: (((2+2)*-3)-7)
+ 1: (((2+2)*-3)-7)
+ 2: -
+    -12
+ 0: -12
+ 1: -12
+    *** Failers
+No match
+    ((2+2)*-3)-7)
+No match
+         
+/^(x(y|(?1){2})z)/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = 'z'
+    xyz
+ 0: xyz
+ 1: xyz
+ 2: y
+    xxyzxyzz 
+ 0: xxyzxyzz
+ 1: xxyzxyzz
+ 2: xyzxyz
+    *** Failers
+No match
+    xxyzz
+No match
+    xxyzxyzxyzz   
+No match
+
+/((< (?: (?(R) \d++  | [^<>]*+) | (?2)) * >))/x
+Capturing subpattern count = 2
+Options: extended
+First char = '<'
+Need char = '>'
+    <>
+ 0: <>
+ 1: <>
+ 2: <>
+    <abcd>
+ 0: <abcd>
+ 1: <abcd>
+ 2: <abcd>
+    <abc <123> hij>
+ 0: <abc <123> hij>
+ 1: <abc <123> hij>
+ 2: <abc <123> hij>
+    <abc <def> hij>
+ 0: <def>
+ 1: <def>
+ 2: <def>
+    <abc<>def> 
+ 0: <abc<>def>
+ 1: <abc<>def>
+ 2: <abc<>def>
+    <abc<>      
+ 0: <>
+ 1: <>
+ 2: <>
+    *** Failers
+No match
+    <abc
+No match
+
+/(?1)/
+Failed: reference to non-existent subpattern at offset 3
+
+/((?2)(abc)/
+Failed: reference to non-existent subpattern at offset 4
+
+/^(abc)def(?1)/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = 'f'
+    abcdefabc
+ 0: abcdefabc
+ 1: abc
+
+/^(a|b|c)=(?1)+/
+Capturing subpattern count = 1
+Options: anchored
+No first char
+Need char = '='
+    a=a
+ 0: a=a
+ 1: a
+    a=b
+ 0: a=b
+ 1: a
+    a=bc  
+ 0: a=bc
+ 1: a
+
+/^(a|b|c)=((?1))+/
+Capturing subpattern count = 2
+Options: anchored
+No first char
+Need char = '='
+    a=a
+ 0: a=a
+ 1: a
+ 2: a
+    a=b
+ 0: a=b
+ 1: a
+ 2: b
+    a=bc  
+ 0: a=bc
+ 1: a
+ 2: c
+
+/a(?P<name1>b|c)d(?P<longername2>e)/D
+------------------------------------------------------------------
+  0  33 Bra 0
+  3   1 a
+  6   6 Bra 1
+  9   1 b
+ 12   6 Alt
+ 15   1 c
+ 18  12 Ket
+ 21   1 d
+ 24   6 Bra 2
+ 27   1 e
+ 30   6 Ket
+ 33  33 Ket
+ 36     End
+------------------------------------------------------------------
+Capturing subpattern count = 2
+Named capturing subpatterns:
+  longername2   2
+  name1         1
+No options
+First char = 'a'
+Need char = 'e'
+    abde
+ 0: abde
+ 1: b
+ 2: e
+    acde 
+ 0: acde
+ 1: c
+ 2: e
+
+/(?:a(?P<c>c(?P<d>d)))(?P<a>a)/D
+------------------------------------------------------------------
+  0  39 Bra 0
+  3  24 Bra 0
+  6   1 a
+  9  15 Bra 1
+ 12   1 c
+ 15   6 Bra 2
+ 18   1 d
+ 21   6 Ket
+ 24  15 Ket
+ 27  24 Ket
+ 30   6 Bra 3
+ 33   1 a
+ 36   6 Ket
+ 39  39 Ket
+ 42     End
+------------------------------------------------------------------
+Capturing subpattern count = 3
+Named capturing subpatterns:
+  a   3
+  c   1
+  d   2
+No options
+First char = 'a'
+Need char = 'a'
+
+/(?P<a>a)...(?P=a)bbb(?P>a)d/D
+------------------------------------------------------------------
+  0  29 Bra 0
+  3   6 Bra 1
+  6   1 a
+  9   6 Ket
+ 12     Any
+ 13     Any
+ 14     Any
+ 15     \1
+ 18   3 bbb
+ 23   3 Recurse
+ 26   1 d
+ 29  29 Ket
+ 32     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Max back reference = 1
+Named capturing subpatterns:
+  a   1
+No options
+First char = 'a'
+Need char = 'd'
+
+/^\W*(?:(?P<one>(?P<two>.)\W*(?P>one)\W*(?P=two)|)|(?P<three>(?P<four>.)\W*(?P>three)\W*(?P=four)|\W*.\W*))\W*$/i
+Capturing subpattern count = 4
+Max back reference = 4
+Named capturing subpatterns:
+  four    4
+  one     1
+  three   3
+  two     2
+Options: anchored caseless
+No first char
+No need char
+    1221
+ 0: 1221
+ 1: 1221
+ 2: 1
+    Satan, oscillate my metallic sonatas!
+ 0: Satan, oscillate my metallic sonatas!
+ 1: <unset>
+ 2: <unset>
+ 3: Satan, oscillate my metallic sonatas
+ 4: S
+    A man, a plan, a canal: Panama!
+ 0: A man, a plan, a canal: Panama!
+ 1: <unset>
+ 2: <unset>
+ 3: A man, a plan, a canal: Panama
+ 4: A
+    Able was I ere I saw Elba. 
+ 0: Able was I ere I saw Elba.
+ 1: <unset>
+ 2: <unset>
+ 3: Able was I ere I saw Elba
+ 4: A
+    *** Failers
+No match
+    The quick brown fox  
+No match
+    
+/((?(R)a|b))\1(?1)?/
+Capturing subpattern count = 1
+Max back reference = 1
+No options
+No first char
+No need char
+  bb
+ 0: bb
+ 1: b
+  bbaa 
+ 0: bba
+ 1: b
+
+/(.*)a/sI
+Capturing subpattern count = 1
+Options: anchored dotall
+No first char
+Need char = 'a'
+
+/(.*)a\1/sI
+Capturing subpattern count = 1
+Max back reference = 1
+Options: dotall
+No first char
+Need char = 'a'
+
+/(.*)a(b)\2/sI
+Capturing subpattern count = 2
+Max back reference = 2
+Options: anchored dotall
+No first char
+Need char = 'b'
+
+/((.*)a|(.*)b)z/sI
+Capturing subpattern count = 3
+Options: anchored dotall
+No first char
+Need char = 'z'
+
+/((.*)a|(.*)b)z\1/sI
+Capturing subpattern count = 3
+Max back reference = 1
+Options: dotall
+No first char
+Need char = 'z'
+
+/((.*)a|(.*)b)z\2/sI
+Capturing subpattern count = 3
+Max back reference = 2
+Options: dotall
+No first char
+Need char = 'z'
+
+/((.*)a|(.*)b)z\3/sI
+Capturing subpattern count = 3
+Max back reference = 3
+Options: dotall
+No first char
+Need char = 'z'
+
+/((.*)a|^(.*)b)z\3/sI
+Capturing subpattern count = 3
+Max back reference = 3
+Options: anchored dotall
+No first char
+Need char = 'z'
+
+/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a/sI
+Capturing subpattern count = 31
+Options: anchored dotall
+No first char
+No need char
+
+/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\31/sI
+Capturing subpattern count = 31
+Max back reference = 31
+Options: dotall
+No first char
+No need char
+
+/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\32/sI
+Capturing subpattern count = 32
+Max back reference = 32
+Options: dotall
+No first char
+No need char
+
+/(a)(bc)/ND
+------------------------------------------------------------------
+  0  22 Bra 0
+  3   6 Bra 0
+  6   1 a
+  9   6 Ket
+ 12   7 Bra 0
+ 15   2 bc
+ 19   7 Ket
+ 22  22 Ket
+ 25     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options:
+First char = 'a'
+Need char = 'c'
+  abc
+ 0: abc
+
+/(?P<one>a)(bc)/ND
+------------------------------------------------------------------
+  0  22 Bra 0
+  3   6 Bra 1
+  6   1 a
+  9   6 Ket
+ 12   7 Bra 0
+ 15   2 bc
+ 19   7 Ket
+ 22  22 Ket
+ 25     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Named capturing subpatterns:
+  one   1
+Options:
+First char = 'a'
+Need char = 'c'
+  abc
+ 0: abc
+ 1: a
+
+/(a)(?P<named>bc)/ND
+------------------------------------------------------------------
+  0  22 Bra 0
+  3   6 Bra 0
+  6   1 a
+  9   6 Ket
+ 12   7 Bra 1
+ 15   2 bc
+ 19   7 Ket
+ 22  22 Ket
+ 25     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Named capturing subpatterns:
+  named   1
+Options:
+First char = 'a'
+Need char = 'c'
+
+/(a+)*zz/
+Capturing subpattern count = 1
+No options
+No first char
+Need char = 'z'
+  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazzbbbbbb\M
+Minimum match limit = 8
+ 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazz
+ 1: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+  aaaaaaaaaaaaaz\M
+Minimum match limit = 32768
+No match
+
+/(aaa(?C1)bbb|ab)/
+Capturing subpattern count = 1
+No options
+First char = 'a'
+Need char = 'b'
+   aaabbb
+--->aaabbb
+  1 ^  ^
+ 0: aaabbb
+ 1: aaabbb
+   aaabbb\C*0
+--->aaabbb
+  1 ^  ^
+ 0: aaabbb
+ 1: aaabbb
+   aaabbb\C*1
+--->aaabbb
+  1 ^  ^
+Callout data = 1
+ 0: ab
+ 1: ab
+   aaabbb\C*-1
+--->aaabbb
+  1 ^  ^
+Callout data = -1
+No match
+
+/ab(?P<one>cd)ef(?P<two>gh)/
+Capturing subpattern count = 2
+Named capturing subpatterns:
+  one   1
+  two   2
+No options
+First char = 'a'
+Need char = 'h'
+    abcdefgh
+ 0: abcdefgh
+ 1: cd
+ 2: gh
+    abcdefgh\C1\Gtwo
+ 0: abcdefgh
+ 1: cd
+ 2: gh
+ 1C cd (2)
+ 2G gh (2)
+    abcdefgh\Cone\Ctwo
+ 0: abcdefgh
+ 1: cd
+ 2: gh
+ 1C cd (2)
+ 2C gh (2)
+    abcdefgh\Cthree  
+no parentheses with name "three"
+ 0: abcdefgh
+ 1: cd
+ 2: gh
+
+/(?P<Tes>)(?P<Test>)/D
+------------------------------------------------------------------
+  0  15 Bra 0
+  3   3 Bra 1
+  6   3 Ket
+  9   3 Bra 2
+ 12   3 Ket
+ 15  15 Ket
+ 18     End
+------------------------------------------------------------------
+Capturing subpattern count = 2
+Named capturing subpatterns:
+  Tes    1
+  Test   2
+No options
+No first char
+No need char
+
+/(?P<Test>)(?P<Tes>)/D
+------------------------------------------------------------------
+  0  15 Bra 0
+  3   3 Bra 1
+  6   3 Ket
+  9   3 Bra 2
+ 12   3 Ket
+ 15  15 Ket
+ 18     End
+------------------------------------------------------------------
+Capturing subpattern count = 2
+Named capturing subpatterns:
+  Tes    2
+  Test   1
+No options
+No first char
+No need char
+
+/(?P<Z>zz)(?P<A>aa)/
+Capturing subpattern count = 2
+Named capturing subpatterns:
+  A   2
+  Z   1
+No options
+First char = 'z'
+Need char = 'a'
+    zzaa\CZ
+ 0: zzaa
+ 1: zz
+ 2: aa
+ 1C zz (2)
+    zzaa\CA
+ 0: zzaa
+ 1: zz
+ 2: aa
+ 2C aa (2)
+
 / End of testinput2 /
 Capturing subpattern count = 0
 No options
diff --git a/testdata/testoutput3 b/testdata/testoutput3
index cbe9aaa..6fdb681 100644
--- a/testdata/testoutput3
+++ b/testdata/testoutput3
@@ -1,2991 +1,118 @@
-PCRE version 3.9 02-Jan-2002
+PCRE version 4.0 17-Feb-2003
 
-/(?<!bar)foo/
-    foo
- 0: foo
-    catfood
- 0: foo
-    arfootle
- 0: foo
-    rfoosh
- 0: foo
+/^[\w]+/
     *** Failers
 No match
-    barfoo
-No match
-    towbarfoo
-No match
-
-/\w{3}(?<!bar)foo/
-    catfood
- 0: catfoo
-    *** Failers
-No match
-    foo
-No match
-    barfoo
-No match
-    towbarfoo
-No match
-
-/(?<=(foo)a)bar/
-    fooabar
- 0: bar
- 1: foo
-    *** Failers
-No match
-    bar
-No match
-    foobbar
-No match
-      
-/\Aabc\z/m
-    abc
- 0: abc
-    *** Failers
-No match
-    abc\n   
-No match
-    qqq\nabc
-No match
-    abc\nzzz
-No match
-    qqq\nabc\nzzz
-No match
-
-"(?>.*/)foo"
-    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/it/you/see/
-No match
-
-"(?>.*/)foo"
-    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
- 0: /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
-
-/(?>(\.\d\d[1-9]?))\d+/
-    1.230003938
- 0: .230003938
- 1: .23
-    1.875000282
- 0: .875000282
- 1: .875
-    *** Failers 
-No match
-    1.235 
-No match
-
-/^((?>\w+)|(?>\s+))*$/
-    now is the time for all good men to come to the aid of the party
- 0: now is the time for all good men to come to the aid of the party
- 1: party
-    *** Failers
-No match
-    this is not a line with only words and spaces!
-No match
-    
-/(\d+)(\w)/
-    12345a
- 0: 12345a
- 1: 12345
- 2: a
-    12345+ 
- 0: 12345
- 1: 1234
- 2: 5
-
-/((?>\d+))(\w)/
-    12345a
- 0: 12345a
- 1: 12345
- 2: a
-    *** Failers
-No match
-    12345+ 
-No match
-
-/(?>a+)b/
-    aaab
- 0: aaab
-
-/((?>a+)b)/
-    aaab
- 0: aaab
- 1: aaab
-
-/(?>(a+))b/
-    aaab
- 0: aaab
- 1: aaa
-
-/(?>b)+/
-    aaabbbccc
- 0: bbb
-
-/(?>a+|b+|c+)*c/
-    aaabbbbccccd
- 0: aaabbbbc
-
-/((?>[^()]+)|\([^()]*\))+/
-    ((abc(ade)ufh()()x
- 0: abc(ade)ufh()()x
- 1: x
-    
-/\(((?>[^()]+)|\([^()]+\))+\)/ 
-    (abc)
- 0: (abc)
- 1: abc
-    (abc(def)xyz)
- 0: (abc(def)xyz)
- 1: xyz
-    *** Failers
-No match
-    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
-No match
-
-/a(?-i)b/i
-    ab
- 0: ab
-    *** Failers 
-No match
-    Ab
-No match
-    aB
-No match
-    AB
-No match
-        
-/(a (?x)b c)d e/
-    a bcd e
- 0: a bcd e
- 1: a bc
-    *** Failers
-No match
-    a b cd e
-No match
-    abcd e   
-No match
-    a bcde 
-No match
- 
-/(a b(?x)c d (?-x)e f)/
-    a bcde f
- 0: a bcde f
- 1: a bcde f
-    *** Failers
-No match
-    abcdef  
-No match
-
-/(a(?i)b)c/
-    abc
- 0: abc
- 1: ab
-    aBc
- 0: aBc
- 1: aB
-    *** Failers
-No match
-    abC
-No match
-    aBC  
-No match
-    Abc
-No match
-    ABc
-No match
-    ABC
-No match
-    AbC
-No match
-    
-/a(?i:b)c/
-    abc
- 0: abc
-    aBc
- 0: aBc
-    *** Failers 
-No match
-    ABC
-No match
-    abC
-No match
-    aBC
-No match
-    
-/a(?i:b)*c/
-    aBc
- 0: aBc
-    aBBc
- 0: aBBc
-    *** Failers 
-No match
-    aBC
-No match
-    aBBC
-No match
-    
-/a(?=b(?i)c)\w\wd/
-    abcd
- 0: abcd
-    abCd
- 0: abCd
-    *** Failers
-No match
-    aBCd
-No match
-    abcD     
-No match
-    
-/(?s-i:more.*than).*million/i
-    more than million
- 0: more than million
-    more than MILLION
- 0: more than MILLION
-    more \n than Million 
- 0: more \x0a than Million
-    *** Failers
-No match
-    MORE THAN MILLION    
-No match
-    more \n than \n million 
-No match
-
-/(?:(?s-i)more.*than).*million/i
-    more than million
- 0: more than million
-    more than MILLION
- 0: more than MILLION
-    more \n than Million 
- 0: more \x0a than Million
-    *** Failers
-No match
-    MORE THAN MILLION    
-No match
-    more \n than \n million 
-No match
-    
-/(?>a(?i)b+)+c/ 
-    abc
- 0: abc
-    aBbc
- 0: aBbc
-    aBBc 
- 0: aBBc
-    *** Failers
-No match
-    Abc
-No match
-    abAb    
-No match
-    abbC 
-No match
-    
-/(?=a(?i)b)\w\wc/
-    abc
- 0: abc
-    aBc
- 0: aBc
-    *** Failers
-No match
-    Ab 
-No match
-    abC
-No match
-    aBC     
-No match
-    
-/(?<=a(?i)b)(\w\w)c/
-    abxxc
- 0: xxc
- 1: xx
-    aBxxc
- 0: xxc
- 1: xx
-    *** Failers
-No match
-    Abxxc
-No match
-    ABxxc
-No match
-    abxxC      
-No match
-
-/(?:(a)|b)(?(1)A|B)/
-    aA
- 0: aA
- 1: a
-    bB
- 0: bB
-    *** Failers
-No match
-    aB
-No match
-    bA    
-No match
-
-/^(a)?(?(1)a|b)+$/
-    aa
- 0: aa
- 1: a
-    b
- 0: b
-    bb  
- 0: bb
-    *** Failers
-No match
-    ab   
-No match
-
-/^(?(?=abc)\w{3}:|\d\d)$/
-    abc:
- 0: abc:
-    12
- 0: 12
-    *** Failers
-No match
-    123
-No match
-    xyz    
-No match
-
-/^(?(?!abc)\d\d|\w{3}:)$/
-    abc:
- 0: abc:
-    12
- 0: 12
-    *** Failers
-No match
-    123
-No match
-    xyz    
-No match
-    
-/(?(?<=foo)bar|cat)/
-    foobar
- 0: bar
-    cat
- 0: cat
-    fcat
- 0: cat
-    focat   
- 0: cat
-    *** Failers
-No match
-    foocat  
-No match
-
-/(?(?<!foo)cat|bar)/
-    foobar
- 0: bar
-    cat
- 0: cat
-    fcat
- 0: cat
-    focat   
- 0: cat
-    *** Failers
-No match
-    foocat  
-No match
-
-/( \( )? [^()]+ (?(1) \) |) /x
-    abcd
- 0: abcd
-    (abcd)
- 0: (abcd)
- 1: (
-    the quick (abcd) fox
- 0: the quick 
-    (abcd   
- 0: abcd
-
-/( \( )? [^()]+ (?(1) \) ) /x
-    abcd
- 0: abcd
-    (abcd)
- 0: (abcd)
- 1: (
-    the quick (abcd) fox
- 0: the quick 
-    (abcd   
- 0: abcd
-
-/^(?(2)a|(1)(2))+$/
-    12
- 0: 12
- 1: 1
- 2: 2
-    12a
- 0: 12a
- 1: 1
- 2: 2
-    12aa
- 0: 12aa
- 1: 1
- 2: 2
-    *** Failers
-No match
-    1234    
-No match
-
-/((?i)blah)\s+\1/
-    blah blah
- 0: blah blah
- 1: blah
-    BLAH BLAH
- 0: BLAH BLAH
- 1: BLAH
-    Blah Blah
- 0: Blah Blah
- 1: Blah
-    blaH blaH
- 0: blaH blaH
- 1: blaH
-    *** Failers
-No match
-    blah BLAH
-No match
-    Blah blah      
-No match
-    blaH blah 
-No match
-
-/((?i)blah)\s+(?i:\1)/
-    blah blah
- 0: blah blah
- 1: blah
-    BLAH BLAH
- 0: BLAH BLAH
- 1: BLAH
-    Blah Blah
- 0: Blah Blah
- 1: Blah
-    blaH blaH
- 0: blaH blaH
- 1: blaH
-    blah BLAH
- 0: blah BLAH
- 1: blah
-    Blah blah      
- 0: Blah blah
- 1: Blah
-    blaH blah 
- 0: blaH blah
- 1: blaH
-
-/(?>a*)*/
-    a
- 0: a
-    aa
- 0: aa
-    aaaa
- 0: aaaa
-    
-/(abc|)+/
-    abc
- 0: abc
- 1: 
-    abcabc
- 0: abcabc
- 1: 
-    abcabcabc
- 0: abcabcabc
- 1: 
-    xyz      
- 0: 
- 1: 
-
-/([a]*)*/
-    a
- 0: a
- 1: 
-    aaaaa 
- 0: aaaaa
- 1: 
- 
-/([ab]*)*/
-    a
- 0: a
- 1: 
-    b
- 0: b
- 1: 
-    ababab
- 0: ababab
- 1: 
-    aaaabcde
- 0: aaaab
- 1: 
-    bbbb    
- 0: bbbb
- 1: 
- 
-/([^a]*)*/
-    b
- 0: b
- 1: 
-    bbbb
- 0: bbbb
- 1: 
-    aaa   
- 0: 
- 1: 
- 
-/([^ab]*)*/
-    cccc
- 0: cccc
- 1: 
-    abab  
- 0: 
- 1: 
- 
-/([a]*?)*/
-    a
- 0: 
- 1: 
-    aaaa 
- 0: 
- 1: 
- 
-/([ab]*?)*/
-    a
- 0: 
- 1: 
-    b
- 0: 
- 1: 
-    abab
- 0: 
- 1: 
-    baba   
- 0: 
- 1: 
- 
-/([^a]*?)*/
-    b
- 0: 
- 1: 
-    bbbb
- 0: 
- 1: 
-    aaa   
- 0: 
- 1: 
- 
-/([^ab]*?)*/
-    c
- 0: 
- 1: 
-    cccc
- 0: 
- 1: 
-    baba   
- 0: 
- 1: 
- 
-/(?>a*)*/
-    a
- 0: a
-    aaabcde 
- 0: aaa
- 
-/((?>a*))*/
-    aaaaa
- 0: aaaaa
- 1: 
-    aabbaa 
- 0: aa
- 1: 
- 
-/((?>a*?))*/
-    aaaaa
- 0: 
- 1: 
-    aabbaa 
- 0: 
- 1: 
-
-/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /x
-    12-sep-98
- 0: 12-sep-98
-    12-09-98
- 0: 12-09-98
-    *** Failers
-No match
-    sep-12-98
-No match
-        
-/(?<=(foo))bar\1/
-    foobarfoo
- 0: barfoo
- 1: foo
-    foobarfootling 
- 0: barfoo
- 1: foo
-    *** Failers
-No match
-    foobar
-No match
-    barfoo   
-No match
-
-/(?i:saturday|sunday)/
-    saturday
- 0: saturday
-    sunday
- 0: sunday
-    Saturday
- 0: Saturday
-    Sunday
- 0: Sunday
-    SATURDAY
- 0: SATURDAY
-    SUNDAY
- 0: SUNDAY
-    SunDay
- 0: SunDay
-    
-/(a(?i)bc|BB)x/
-    abcx
- 0: abcx
- 1: abc
-    aBCx
- 0: aBCx
- 1: aBC
-    bbx
- 0: bbx
- 1: bb
-    BBx
- 0: BBx
- 1: BB
-    *** Failers
-No match
-    abcX
-No match
-    aBCX
-No match
-    bbX
-No match
-    BBX               
-No match
-
-/^([ab](?i)[cd]|[ef])/
-    ac
- 0: ac
- 1: ac
-    aC
- 0: aC
- 1: aC
-    bD
- 0: bD
- 1: bD
-    elephant
- 0: e
- 1: e
-    Europe 
- 0: E
- 1: E
-    frog
- 0: f
- 1: f
-    France
- 0: F
- 1: F
-    *** Failers
-No match
-    Africa     
-No match
-
-/^(ab|a(?i)[b-c](?m-i)d|x(?i)y|z)/
-    ab
- 0: ab
- 1: ab
-    aBd
- 0: aBd
- 1: aBd
-    xy
- 0: xy
- 1: xy
-    xY
- 0: xY
- 1: xY
-    zebra
- 0: z
- 1: z
-    Zambesi
- 0: Z
- 1: Z
-    *** Failers
-No match
-    aCD  
-No match
-    XY  
-No match
-
-/(?<=foo\n)^bar/m
-    foo\nbar
- 0: bar
-    *** Failers
-No match
-    bar
-No match
-    baz\nbar   
-No match
-
-/(?<=(?<!foo)bar)baz/
-    barbaz
- 0: baz
-    barbarbaz 
- 0: baz
-    koobarbaz 
- 0: baz
-    *** Failers
-No match
-    baz
-No match
-    foobarbaz 
-No match
-
-/The case of aaaaaa is missed out below because I think Perl 5.005_02 gets/
-/it wrong; it sets $1 to aaa rather than aa. Compare the following test,/
-No match
-/where it does set $1 to aa when matching aaaaaa./
-No match
-
-/^(a\1?){4}$/
-    a
-No match
-    aa
-No match
-    aaa
-No match
-    aaaa
- 0: aaaa
- 1: a
-    aaaaa
- 0: aaaaa
- 1: a
-    aaaaaaa
- 0: aaaaaaa
- 1: a
-    aaaaaaaa
-No match
-    aaaaaaaaa
-No match
-    aaaaaaaaaa
- 0: aaaaaaaaaa
- 1: aaaa
-    aaaaaaaaaaa
-No match
-    aaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaaaaa               
-No match
-
-/^(a\1?)(a\1?)(a\2?)(a\3?)$/
-    a
-No match
-    aa
-No match
-    aaa
-No match
-    aaaa
- 0: aaaa
- 1: a
- 2: a
- 3: a
- 4: a
-    aaaaa
- 0: aaaaa
- 1: a
- 2: aa
- 3: a
- 4: a
-    aaaaaa
- 0: aaaaaa
- 1: a
- 2: aa
- 3: a
- 4: aa
-    aaaaaaa
- 0: aaaaaaa
- 1: a
- 2: aa
- 3: aaa
- 4: a
-    aaaaaaaa
-No match
-    aaaaaaaaa
-No match
-    aaaaaaaaaa
- 0: aaaaaaaaaa
- 1: a
- 2: aa
- 3: aaa
- 4: aaaa
-    aaaaaaaaaaa
-No match
-    aaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaaaa
-No match
-    aaaaaaaaaaaaaaaa               
-No match
-
-/The following tests are taken from the Perl 5.005 test suite; some of them/
-/are compatible with 5.004, but I'd rather not have to sort them out./
-No match
-
-/abc/
-    abc
- 0: abc
-    xabcy
- 0: abc
-    ababc
- 0: abc
-    *** Failers
-No match
-    xbc
-No match
-    axc
-No match
-    abx
-No match
-
-/ab*c/
-    abc
- 0: abc
-
-/ab*bc/
-    abc
- 0: abc
-    abbc
- 0: abbc
-    abbbbc
- 0: abbbbc
-
-/.{1}/
-    abbbbc
- 0: a
-
-/.{3,4}/
-    abbbbc
- 0: abbb
-
-/ab{0,}bc/
-    abbbbc
- 0: abbbbc
-
-/ab+bc/
-    abbc
- 0: abbc
-    *** Failers
-No match
-    abc
-No match
-    abq
-No match
-
-/ab{1,}bc/
-
-/ab+bc/
-    abbbbc
- 0: abbbbc
-
-/ab{1,}bc/
-    abbbbc
- 0: abbbbc
-
-/ab{1,3}bc/
-    abbbbc
- 0: abbbbc
-
-/ab{3,4}bc/
-    abbbbc
- 0: abbbbc
-
-/ab{4,5}bc/
-    *** Failers
-No match
-    abq
-No match
-    abbbbc
-No match
-
-/ab?bc/
-    abbc
- 0: abbc
-    abc
- 0: abc
-
-/ab{0,1}bc/
-    abc
- 0: abc
-
-/ab?bc/
-
-/ab?c/
-    abc
- 0: abc
-
-/ab{0,1}c/
-    abc
- 0: abc
-
-/^abc$/
-    abc
- 0: abc
-    *** Failers
-No match
-    abbbbc
-No match
-    abcc
+    École
 No match
 
-/^abc/
-    abcc
- 0: abc
+/^[\w]+/Lfr
+    École
+ 0: École
 
-/^abc$/
-
-/abc$/
-    aabc
- 0: abc
-    *** Failers
-No match
-    aabc
- 0: abc
-    aabcd
-No match
-
-/^/
-    abc
- 0: 
-
-/$/
-    abc
- 0: 
-
-/a.c/
-    abc
- 0: abc
-    axc
- 0: axc
-
-/a.*c/
-    axyzc
- 0: axyzc
-
-/a[bc]d/
-    abd
- 0: abd
-    *** Failers
-No match
-    axyzd
-No match
-    abc
-No match
-
-/a[b-d]e/
-    ace
- 0: ace
-
-/a[b-d]/
-    aac
- 0: ac
-
-/a[-b]/
-    a-
- 0: a-
-
-/a[b-]/
-    a-
- 0: a-
-
-/a]/
-    a]
- 0: a]
-
-/a[]]b/
-    a]b
- 0: a]b
-
-/a[^bc]d/
-    aed
- 0: aed
-    *** Failers
-No match
-    abd
-No match
-    abd
-No match
-
-/a[^-b]c/
-    adc
- 0: adc
-
-/a[^]b]c/
-    adc
- 0: adc
+/^[\w]+/
     *** Failers
 No match
-    a-c
- 0: a-c
-    a]c
+    École
 No match
 
-/\ba\b/
-    a-
- 0: a
-    -a
- 0: a
-    -a-
- 0: a
+/^[\W]+/
+    École
+ 0: \xc9
 
-/\by\b/
+/^[\W]+/Lfr
     *** Failers
-No match
-    xy
-No match
-    yz
-No match
-    xyz
+ 0: *** 
+    École
 No match
 
-/\Ba\B/
+/[\b]/
+    \b
+ 0: \x08
     *** Failers
- 0: a
-    a-
 No match
-    -a
-No match
-    -a-
-No match
-
-/\By\b/
-    xy
- 0: y
-
-/\by\B/
-    yz
- 0: y
-
-/\By\B/
-    xyz
- 0: y
-
-/\w/
-    a
- 0: a
-
-/\W/
-    -
- 0: -
-    *** Failers
- 0: *
-    -
- 0: -
-    a
-No match
-
-/a\sb/
-    a b
- 0: a b
-
-/a\Sb/
-    a-b
- 0: a-b
-    *** Failers
-No match
-    a-b
- 0: a-b
-    a b
-No match
-
-/\d/
-    1
- 0: 1
-
-/\D/
-    -
- 0: -
-    *** Failers
- 0: *
-    -
- 0: -
-    1
-No match
-
-/[\w]/
     a
- 0: a
-
-/[\W]/
-    -
- 0: -
-    *** Failers
- 0: *
-    -
- 0: -
-    a
-No match
-
-/a[\s]b/
-    a b
- 0: a b
-
-/a[\S]b/
-    a-b
- 0: a-b
-    *** Failers
-No match
-    a-b
- 0: a-b
-    a b
-No match
-
-/[\d]/
-    1
- 0: 1
-
-/[\D]/
-    -
- 0: -
-    *** Failers
- 0: *
-    -
- 0: -
-    1
-No match
-
-/ab|cd/
-    abc
- 0: ab
-    abcd
- 0: ab
-
-/()ef/
-    def
- 0: ef
- 1: 
-
-/$b/
-
-/a\(b/
-    a(b
- 0: a(b
-
-/a\(*b/
-    ab
- 0: ab
-    a((b
- 0: a((b
-
-/a\\b/
-    a\b
-No match
-
-/((a))/
-    abc
- 0: a
- 1: a
- 2: a
-
-/(a)b(c)/
-    abc
- 0: abc
- 1: a
- 2: c
-
-/a+b+c/
-    aabbabc
- 0: abc
-
-/a{1,}b{1,}c/
-    aabbabc
- 0: abc
-
-/a.+?c/
-    abcabc
- 0: abc
-
-/(a+|b)*/
-    ab
- 0: ab
- 1: b
-
-/(a+|b){0,}/
-    ab
- 0: ab
- 1: b
-
-/(a+|b)+/
-    ab
- 0: ab
- 1: b
-
-/(a+|b){1,}/
-    ab
- 0: ab
- 1: b
-
-/(a+|b)?/
-    ab
- 0: a
- 1: a
-
-/(a+|b){0,1}/
-    ab
- 0: a
- 1: a
-
-/[^ab]*/
-    cde
- 0: cde
-
-/abc/
-    *** Failers
-No match
-    b
-No match
-    
-
-/a*/
-    
-
-/([abc])*d/
-    abbbcd
- 0: abbbcd
- 1: c
-
-/([abc])*bcd/
-    abcd
- 0: abcd
- 1: a
-
-/a|b|c|d|e/
-    e
- 0: e
-
-/(a|b|c|d|e)f/
-    ef
- 0: ef
- 1: e
-
-/abcd*efg/
-    abcdefg
- 0: abcdefg
-
-/ab*/
-    xabyabbbz
- 0: ab
-    xayabbbz
- 0: a
-
-/(ab|cd)e/
-    abcde
- 0: cde
- 1: cd
-
-/[abhgefdc]ij/
-    hij
- 0: hij
-
-/^(ab|cd)e/
-
-/(abc|)ef/
-    abcdef
- 0: ef
- 1: 
-
-/(a|b)c*d/
-    abcd
- 0: bcd
- 1: b
-
-/(ab|ab*)bc/
-    abc
- 0: abc
- 1: a
-
-/a([bc]*)c*/
-    abc
- 0: abc
- 1: bc
-
-/a([bc]*)(c*d)/
-    abcd
- 0: abcd
- 1: bc
- 2: d
-
-/a([bc]+)(c*d)/
-    abcd
- 0: abcd
- 1: bc
- 2: d
-
-/a([bc]*)(c+d)/
-    abcd
- 0: abcd
- 1: b
- 2: cd
-
-/a[bcd]*dcdcde/
-    adcdcde
- 0: adcdcde
-
-/a[bcd]+dcdcde/
-    *** Failers
-No match
-    abcde
 No match
-    adcdcde
-No match
-
-/(ab|a)b*c/
-    abc
- 0: abc
- 1: ab
-
-/((a)(b)c)(d)/
-    abcd
- 0: abcd
- 1: abc
- 2: a
- 3: b
- 4: d
 
-/[a-zA-Z_][a-zA-Z0-9_]*/
-    alpha
- 0: alpha
-
-/^a(bc+|b[eh])g|.h$/
-    abh
- 0: bh
-
-/(bc+d$|ef*g.|h?i(j|k))/
-    effgz
- 0: effgz
- 1: effgz
-    ij
- 0: ij
- 1: ij
- 2: j
-    reffgz
- 0: effgz
- 1: effgz
+/[\b]/Lfr
+    \b
+ 0: \x08
     *** Failers
 No match
-    effg
-No match
-    bcdd
-No match
-
-/((((((((((a))))))))))/
-    a
- 0: a
- 1: a
- 2: a
- 3: a
- 4: a
- 5: a
- 6: a
- 7: a
- 8: a
- 9: a
-10: a
-
-/((((((((((a))))))))))\10/
-    aa
- 0: aa
- 1: a
- 2: a
- 3: a
- 4: a
- 5: a
- 6: a
- 7: a
- 8: a
- 9: a
-10: a
-
-/(((((((((a)))))))))/
-    a
- 0: a
- 1: a
- 2: a
- 3: a
- 4: a
- 5: a
- 6: a
- 7: a
- 8: a
- 9: a
-
-/multiple words of text/
-    *** Failers
-No match
-    aa
-No match
-    uh-uh
-No match
-
-/multiple words/
-    multiple words, yeah
- 0: multiple words
-
-/(.*)c(.*)/
-    abcde
- 0: abcde
- 1: ab
- 2: de
-
-/\((.*), (.*)\)/
-    (a, b)
- 0: (a, b)
- 1: a
- 2: b
-
-/[k]/
-
-/abcd/
-    abcd
- 0: abcd
-
-/a(bc)d/
-    abcd
- 0: abcd
- 1: bc
-
-/a[-]?c/
-    ac
- 0: ac
-
-/(abc)\1/
-    abcabc
- 0: abcabc
- 1: abc
-
-/([a-c]*)\1/
-    abcabc
- 0: abcabc
- 1: abc
-
-/(a)|\1/
     a
- 0: a
- 1: a
-    *** Failers
- 0: a
- 1: a
-    ab
- 0: a
- 1: a
-    x
 No match
 
-/(([a-c])b*?\2)*/
-    ababbbcbc
- 0: ababb
- 1: bb
- 2: b
-
-/(([a-c])b*?\2){3}/
-    ababbbcbc
- 0: ababbbcbc
- 1: cbc
- 2: c
-
-/((\3|b)\2(a)x)+/
-    aaaxabaxbaaxbbax
- 0: bbax
- 1: bbax
- 2: b
- 3: a
-
-/((\3|b)\2(a)){2,}/
-    bbaababbabaaaaabbaaaabba
- 0: bbaaaabba
- 1: bba
- 2: b
- 3: a
-
-/abc/i
-    ABC
- 0: ABC
-    XABCY
- 0: ABC
-    ABABC
- 0: ABC
+/^\w+/
     *** Failers
 No match
-    aaxabxbaxbbx
-No match
-    XBC
-No match
-    AXC
+    École
 No match
-    ABX
-No match
-
-/ab*c/i
-    ABC
- 0: ABC
-
-/ab*bc/i
-    ABC
- 0: ABC
-    ABBC
- 0: ABBC
 
-/ab*?bc/i
-    ABBBBC
- 0: ABBBBC
+/^\w+/Lfr
+    École
+ 0: École
 
-/ab{0,}?bc/i
-    ABBBBC
- 0: ABBBBC
+/(.+)\b(.+)/
+    École
+ 0: \xc9cole
+ 1: \xc9
+ 2: cole
 
-/ab+?bc/i
-    ABBC
- 0: ABBC
-
-/ab+bc/i
+/(.+)\b(.+)/Lfr
     *** Failers
-No match
-    ABC
-No match
-    ABQ
-No match
-
-/ab{1,}bc/i
-
-/ab+bc/i
-    ABBBBC
- 0: ABBBBC
-
-/ab{1,}?bc/i
-    ABBBBC
- 0: ABBBBC
-
-/ab{1,3}?bc/i
-    ABBBBC
- 0: ABBBBC
-
-/ab{3,4}?bc/i
-    ABBBBC
- 0: ABBBBC
-
-/ab{4,5}?bc/i
-    *** Failers
-No match
-    ABQ
-No match
-    ABBBBC
-No match
-
-/ab??bc/i
-    ABBC
- 0: ABBC
-    ABC
- 0: ABC
-
-/ab{0,1}?bc/i
-    ABC
- 0: ABC
-
-/ab??bc/i
-
-/ab??c/i
-    ABC
- 0: ABC
-
-/ab{0,1}?c/i
-    ABC
- 0: ABC
-
-/^abc$/i
-    ABC
- 0: ABC
-    *** Failers
-No match
-    ABBBBC
-No match
-    ABCC
-No match
-
-/^abc/i
-    ABCC
- 0: ABC
-
-/^abc$/i
-
-/abc$/i
-    AABC
- 0: ABC
-
-/^/i
-    ABC
- 0: 
-
-/$/i
-    ABC
- 0: 
-
-/a.c/i
-    ABC
- 0: ABC
-    AXC
- 0: AXC
-
-/a.*?c/i
-    AXYZC
- 0: AXYZC
-
-/a.*c/i
-    *** Failers
-No match
-    AABC
- 0: AABC
-    AXYZD
-No match
-
-/a[bc]d/i
-    ABD
- 0: ABD
-
-/a[b-d]e/i
-    ACE
- 0: ACE
-    *** Failers
-No match
-    ABC
-No match
-    ABD
-No match
-
-/a[b-d]/i
-    AAC
- 0: AC
-
-/a[-b]/i
-    A-
- 0: A-
-
-/a[b-]/i
-    A-
- 0: A-
-
-/a]/i
-    A]
- 0: A]
-
-/a[]]b/i
-    A]B
- 0: A]B
-
-/a[^bc]d/i
-    AED
- 0: AED
-
-/a[^-b]c/i
-    ADC
- 0: ADC
-    *** Failers
-No match
-    ABD
-No match
-    A-C
-No match
-
-/a[^]b]c/i
-    ADC
- 0: ADC
-
-/ab|cd/i
-    ABC
- 0: AB
-    ABCD
- 0: AB
-
-/()ef/i
-    DEF
- 0: EF
- 1: 
-
-/$b/i
-    *** Failers
-No match
-    A]C
-No match
-    B
-No match
-
-/a\(b/i
-    A(B
- 0: A(B
-
-/a\(*b/i
-    AB
- 0: AB
-    A((B
- 0: A((B
-
-/a\\b/i
-    A\B
-No match
-
-/((a))/i
-    ABC
- 0: A
- 1: A
- 2: A
-
-/(a)b(c)/i
-    ABC
- 0: ABC
- 1: A
- 2: C
-
-/a+b+c/i
-    AABBABC
- 0: ABC
-
-/a{1,}b{1,}c/i
-    AABBABC
- 0: ABC
-
-/a.+?c/i
-    ABCABC
- 0: ABC
-
-/a.*?c/i
-    ABCABC
- 0: ABC
-
-/a.{0,5}?c/i
-    ABCABC
- 0: ABC
-
-/(a+|b)*/i
-    AB
- 0: AB
- 1: B
-
-/(a+|b){0,}/i
-    AB
- 0: AB
- 1: B
-
-/(a+|b)+/i
-    AB
- 0: AB
- 1: B
-
-/(a+|b){1,}/i
-    AB
- 0: AB
- 1: B
-
-/(a+|b)?/i
-    AB
- 0: A
- 1: A
-
-/(a+|b){0,1}/i
-    AB
- 0: A
- 1: A
-
-/(a+|b){0,1}?/i
-    AB
- 0: 
-
-/[^ab]*/i
-    CDE
- 0: CDE
-
-/abc/i
-
-/a*/i
-    
-
-/([abc])*d/i
-    ABBBCD
- 0: ABBBCD
- 1: C
-
-/([abc])*bcd/i
-    ABCD
- 0: ABCD
- 1: A
-
-/a|b|c|d|e/i
-    E
- 0: E
-
-/(a|b|c|d|e)f/i
-    EF
- 0: EF
- 1: E
-
-/abcd*efg/i
-    ABCDEFG
- 0: ABCDEFG
-
-/ab*/i
-    XABYABBBZ
- 0: AB
-    XAYABBBZ
- 0: A
-
-/(ab|cd)e/i
-    ABCDE
- 0: CDE
- 1: CD
-
-/[abhgefdc]ij/i
-    HIJ
- 0: HIJ
-
-/^(ab|cd)e/i
-    ABCDE
-No match
-
-/(abc|)ef/i
-    ABCDEF
- 0: EF
- 1: 
-
-/(a|b)c*d/i
-    ABCD
- 0: BCD
- 1: B
-
-/(ab|ab*)bc/i
-    ABC
- 0: ABC
- 1: A
-
-/a([bc]*)c*/i
-    ABC
- 0: ABC
- 1: BC
-
-/a([bc]*)(c*d)/i
-    ABCD
- 0: ABCD
- 1: BC
- 2: D
-
-/a([bc]+)(c*d)/i
-    ABCD
- 0: ABCD
- 1: BC
- 2: D
-
-/a([bc]*)(c+d)/i
-    ABCD
- 0: ABCD
- 1: B
- 2: CD
-
-/a[bcd]*dcdcde/i
-    ADCDCDE
- 0: ADCDCDE
-
-/a[bcd]+dcdcde/i
-
-/(ab|a)b*c/i
-    ABC
- 0: ABC
- 1: AB
-
-/((a)(b)c)(d)/i
-    ABCD
- 0: ABCD
- 1: ABC
- 2: A
- 3: B
- 4: D
-
-/[a-zA-Z_][a-zA-Z0-9_]*/i
-    ALPHA
- 0: ALPHA
-
-/^a(bc+|b[eh])g|.h$/i
-    ABH
- 0: BH
-
-/(bc+d$|ef*g.|h?i(j|k))/i
-    EFFGZ
- 0: EFFGZ
- 1: EFFGZ
-    IJ
- 0: IJ
- 1: IJ
- 2: J
-    REFFGZ
- 0: EFFGZ
- 1: EFFGZ
-    *** Failers
-No match
-    ADCDCDE
-No match
-    EFFG
-No match
-    BCDD
-No match
-
-/((((((((((a))))))))))/i
-    A
- 0: A
- 1: A
- 2: A
- 3: A
- 4: A
- 5: A
- 6: A
- 7: A
- 8: A
- 9: A
-10: A
-
-/((((((((((a))))))))))\10/i
-    AA
- 0: AA
- 1: A
- 2: A
- 3: A
- 4: A
- 5: A
- 6: A
- 7: A
- 8: A
- 9: A
-10: A
-
-/(((((((((a)))))))))/i
-    A
- 0: A
- 1: A
- 2: A
- 3: A
- 4: A
- 5: A
- 6: A
- 7: A
- 8: A
- 9: A
-
-/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/i
-    A
- 0: A
- 1: A
-
-/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/i
-    C
- 0: C
- 1: C
-
-/multiple words of text/i
-    *** Failers
-No match
-    AA
-No match
-    UH-UH
-No match
-
-/multiple words/i
-    MULTIPLE WORDS, YEAH
- 0: MULTIPLE WORDS
-
-/(.*)c(.*)/i
-    ABCDE
- 0: ABCDE
- 1: AB
- 2: DE
-
-/\((.*), (.*)\)/i
-    (A, B)
- 0: (A, B)
- 1: A
- 2: B
-
-/[k]/i
-
-/abcd/i
-    ABCD
- 0: ABCD
-
-/a(bc)d/i
-    ABCD
- 0: ABCD
- 1: BC
-
-/a[-]?c/i
-    AC
- 0: AC
-
-/(abc)\1/i
-    ABCABC
- 0: ABCABC
- 1: ABC
-
-/([a-c]*)\1/i
-    ABCABC
- 0: ABCABC
- 1: ABC
-
-/a(?!b)./
-    abad
- 0: ad
-
-/a(?=d)./
-    abad
- 0: ad
-
-/a(?=c|d)./
-    abad
- 0: ad
-
-/a(?:b|c|d)(.)/
-    ace
- 0: ace
- 1: e
-
-/a(?:b|c|d)*(.)/
-    ace
- 0: ace
- 1: e
-
-/a(?:b|c|d)+?(.)/
-    ace
- 0: ace
- 1: e
-    acdbcdbe
- 0: acd
- 1: d
-
-/a(?:b|c|d)+(.)/
-    acdbcdbe
- 0: acdbcdbe
- 1: e
-
-/a(?:b|c|d){2}(.)/
-    acdbcdbe
- 0: acdb
- 1: b
-
-/a(?:b|c|d){4,5}(.)/
-    acdbcdbe
- 0: acdbcdb
- 1: b
-
-/a(?:b|c|d){4,5}?(.)/
-    acdbcdbe
- 0: acdbcd
- 1: d
-
-/((foo)|(bar))*/
-    foobar
- 0: foobar
- 1: bar
- 2: foo
- 3: bar
-
-/a(?:b|c|d){6,7}(.)/
-    acdbcdbe
- 0: acdbcdbe
- 1: e
-
-/a(?:b|c|d){6,7}?(.)/
-    acdbcdbe
- 0: acdbcdbe
- 1: e
-
-/a(?:b|c|d){5,6}(.)/
-    acdbcdbe
- 0: acdbcdbe
- 1: e
-
-/a(?:b|c|d){5,6}?(.)/
-    acdbcdbe
- 0: acdbcdb
- 1: b
-
-/a(?:b|c|d){5,7}(.)/
-    acdbcdbe
- 0: acdbcdbe
- 1: e
-
-/a(?:b|c|d){5,7}?(.)/
-    acdbcdbe
- 0: acdbcdb
- 1: b
-
-/a(?:b|(c|e){1,2}?|d)+?(.)/
-    ace
- 0: ace
- 1: c
- 2: e
-
-/^(.+)?B/
-    AB
- 0: AB
- 1: A
-
-/^([^a-z])|(\^)$/
-    .
- 0: .
- 1: .
-
-/^[<>]&/
-    <&OUT
- 0: <&
-
-/^(a\1?){4}$/
-    aaaaaaaaaa
- 0: aaaaaaaaaa
- 1: aaaa
-    *** Failers
-No match
-    AB
-No match
-    aaaaaaaaa
-No match
-    aaaaaaaaaaa
-No match
-
-/^(a(?(1)\1)){4}$/
-    aaaaaaaaaa
- 0: aaaaaaaaaa
- 1: aaaa
-    *** Failers
-No match
-    aaaaaaaaa
-No match
-    aaaaaaaaaaa
-No match
-
-/(?:(f)(o)(o)|(b)(a)(r))*/
-    foobar
- 0: foobar
- 1: f
- 2: o
- 3: o
- 4: b
- 5: a
- 6: r
-
-/(?<=a)b/
-    ab
- 0: b
-    *** Failers
-No match
-    cb
-No match
-    b
-No match
-
-/(?<!c)b/
-    ab
- 0: b
-    b
- 0: b
-    b
- 0: b
-
-/(?:..)*a/
-    aba
- 0: aba
-
-/(?:..)*?a/
-    aba
- 0: a
-
-/^(?:b|a(?=(.)))*\1/
-    abc
- 0: ab
- 1: b
-
-/^(){3,5}/
-    abc
- 0: 
- 1: 
-
-/^(a+)*ax/
-    aax
- 0: aax
- 1: a
-
-/^((a|b)+)*ax/
-    aax
- 0: aax
- 1: a
- 2: a
-
-/^((a|bc)+)*ax/
-    aax
- 0: aax
- 1: a
- 2: a
-
-/(a|x)*ab/
-    cab
- 0: ab
-
-/(a)*ab/
-    cab
- 0: ab
-
-/(?:(?i)a)b/
-    ab
- 0: ab
-
-/((?i)a)b/
-    ab
- 0: ab
- 1: a
-
-/(?:(?i)a)b/
-    Ab
- 0: Ab
-
-/((?i)a)b/
-    Ab
- 0: Ab
- 1: A
-
-/(?:(?i)a)b/
-    *** Failers
-No match
-    cb
-No match
-    aB
-No match
-
-/((?i)a)b/
-
-/(?i:a)b/
-    ab
- 0: ab
-
-/((?i:a))b/
-    ab
- 0: ab
- 1: a
-
-/(?i:a)b/
-    Ab
- 0: Ab
-
-/((?i:a))b/
-    Ab
- 0: Ab
- 1: A
-
-/(?i:a)b/
-    *** Failers
-No match
-    aB
-No match
-    aB
-No match
-
-/((?i:a))b/
-
-/(?:(?-i)a)b/i
-    ab
- 0: ab
-
-/((?-i)a)b/i
-    ab
- 0: ab
- 1: a
-
-/(?:(?-i)a)b/i
-    aB
- 0: aB
-
-/((?-i)a)b/i
-    aB
- 0: aB
- 1: a
-
-/(?:(?-i)a)b/i
-    *** Failers
-No match
-    aB
- 0: aB
-    Ab
-No match
-
-/((?-i)a)b/i
-
-/(?:(?-i)a)b/i
-    aB
- 0: aB
-
-/((?-i)a)b/i
-    aB
- 0: aB
- 1: a
-
-/(?:(?-i)a)b/i
-    *** Failers
-No match
-    Ab
-No match
-    AB
-No match
-
-/((?-i)a)b/i
-
-/(?-i:a)b/i
-    ab
- 0: ab
-
-/((?-i:a))b/i
-    ab
- 0: ab
- 1: a
-
-/(?-i:a)b/i
-    aB
- 0: aB
-
-/((?-i:a))b/i
-    aB
- 0: aB
- 1: a
-
-/(?-i:a)b/i
-    *** Failers
-No match
-    AB
-No match
-    Ab
-No match
-
-/((?-i:a))b/i
-
-/(?-i:a)b/i
-    aB
- 0: aB
-
-/((?-i:a))b/i
-    aB
- 0: aB
- 1: a
-
-/(?-i:a)b/i
-    *** Failers
-No match
-    Ab
-No match
-    AB
-No match
-
-/((?-i:a))b/i
-
-/((?-i:a.))b/i
-    *** Failers
-No match
-    AB
-No match
-    a\nB
-No match
-
-/((?s-i:a.))b/i
-    a\nB
- 0: a\x0aB
- 1: a\x0a
-
-/(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))/
-    cabbbb
- 0: cabbbb
-
-/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/
-    caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
- 0: caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
-
-/(ab)\d\1/i
-    Ab4ab
- 0: Ab4ab
- 1: Ab
-    ab4Ab
- 0: ab4Ab
- 1: ab
-
-/foo\w*\d{4}baz/
-    foobar1234baz
- 0: foobar1234baz
-
-/x(~~)*(?:(?:F)?)?/
-    x~~
- 0: x~~
- 1: ~~
-
-/^a(?#xxx){3}c/
-    aaac
- 0: aaac
-
-/^a (?#xxx) (?#yyy) {3}c/x
-    aaac
- 0: aaac
-
-/(?<![cd])b/
-    *** Failers
-No match
-    B\nB
-No match
-    dbcb
-No match
-
-/(?<![cd])[ab]/
-    dbaacb
- 0: a
-
-/(?<!(c|d))b/
-
-/(?<!(c|d))[ab]/
-    dbaacb
- 0: a
-
-/(?<!cd)[ab]/
-    cdaccb
- 0: b
-
-/^(?:a?b?)*$/
-    *** Failers
-No match
-    dbcb
-No match
-    a--
-No match
-
-/((?s)^a(.))((?m)^b$)/
-    a\nb\nc\n
- 0: a\x0ab
- 1: a\x0a
- 2: \x0a
- 3: b
-
-/((?m)^b$)/
-    a\nb\nc\n
- 0: b
- 1: b
-
-/(?m)^b/
-    a\nb\n
- 0: b
-
-/(?m)^(b)/
-    a\nb\n
- 0: b
- 1: b
-
-/((?m)^b)/
-    a\nb\n
- 0: b
- 1: b
-
-/\n((?m)^b)/
-    a\nb\n
- 0: \x0ab
- 1: b
-
-/((?s).)c(?!.)/
-    a\nb\nc\n
- 0: \x0ac
- 1: \x0a
-    a\nb\nc\n
- 0: \x0ac
- 1: \x0a
-
-/((?s)b.)c(?!.)/
-    a\nb\nc\n
- 0: b\x0ac
- 1: b\x0a
-    a\nb\nc\n
- 0: b\x0ac
- 1: b\x0a
-
-/^b/
-
-/()^b/
-    *** Failers
-No match
-    a\nb\nc\n
-No match
-    a\nb\nc\n
-No match
-
-/((?m)^b)/
-    a\nb\nc\n
- 0: b
- 1: b
-
-/(?(1)a|b)/
-
-/(?(1)b|a)/
-    a
- 0: a
-
-/(x)?(?(1)a|b)/
-    *** Failers
-No match
-    a
-No match
-    a
-No match
-
-/(x)?(?(1)b|a)/
-    a
- 0: a
-
-/()?(?(1)b|a)/
-    a
- 0: a
-
-/()(?(1)b|a)/
-
-/()?(?(1)a|b)/
-    a
- 0: a
- 1: 
-
-/^(\()?blah(?(1)(\)))$/
-    (blah)
- 0: (blah)
- 1: (
- 2: )
-    blah
- 0: blah
-    *** Failers
-No match
-    a
-No match
-    blah)
-No match
-    (blah
-No match
-
-/^(\(+)?blah(?(1)(\)))$/
-    (blah)
- 0: (blah)
- 1: (
- 2: )
-    blah
- 0: blah
-    *** Failers
-No match
-    blah)
-No match
-    (blah
-No match
-
-/(?(?!a)a|b)/
-
-/(?(?!a)b|a)/
-    a
- 0: a
-
-/(?(?=a)b|a)/
-    *** Failers
-No match
-    a
-No match
-    a
-No match
-
-/(?(?=a)a|b)/
-    a
- 0: a
-
-/(?=(a+?))(\1ab)/
-    aaab
- 0: aab
- 1: a
- 2: aab
-
-/^(?=(a+?))\1ab/
-
-/(\w+:)+/
-    one:
- 0: one:
- 1: one:
-
-/$(?<=^(a))/
-    a
- 0: 
- 1: a
-
-/(?=(a+?))(\1ab)/
-    aaab
- 0: aab
- 1: a
- 2: aab
-
-/^(?=(a+?))\1ab/
-    *** Failers
-No match
-    aaab
-No match
-    aaab
-No match
-
-/([\w:]+::)?(\w+)$/
-    abcd
- 0: abcd
- 1: <unset>
- 2: abcd
-    xy:z:::abcd
- 0: xy:z:::abcd
- 1: xy:z:::
- 2: abcd
-
-/^[^bcd]*(c+)/
-    aexycd
- 0: aexyc
- 1: c
-
-/(a*)b+/
-    caab
- 0: aab
- 1: aa
-
-/([\w:]+::)?(\w+)$/
-    abcd
- 0: abcd
- 1: <unset>
- 2: abcd
-    xy:z:::abcd
- 0: xy:z:::abcd
- 1: xy:z:::
- 2: abcd
-    *** Failers
- 0: Failers
- 1: <unset>
+ 0: *** Failers
+ 1: *** 
  2: Failers
-    abcd:
-No match
-    abcd:
-No match
-
-/^[^bcd]*(c+)/
-    aexycd
- 0: aexyc
- 1: c
-
-/(>a+)ab/
-
-/(?>a+)b/
-    aaab
- 0: aaab
-
-/([[:]+)/
-    a:[b]:
- 0: :[
- 1: :[
-
-/([[=]+)/
-    a=[b]=
- 0: =[
- 1: =[
-
-/([[.]+)/
-    a.[b].
- 0: .[
- 1: .[
-
-/((?>a+)b)/
-    aaab
- 0: aaab
- 1: aaab
-
-/(?>(a+))b/
-    aaab
- 0: aaab
- 1: aaa
-
-/((?>[^()]+)|\([^()]*\))+/
-    ((abc(ade)ufh()()x
- 0: abc(ade)ufh()()x
- 1: x
-
-/a\Z/
-    *** Failers
-No match
-    aaab
-No match
-    a\nb\n
-No match
-
-/b\Z/
-    a\nb\n
- 0: b
-
-/b\z/
-
-/b\Z/
-    a\nb
- 0: b
-
-/b\z/
-    a\nb
- 0: b
-    *** Failers
-No match
-    
-/^(?>(?(1)\.|())[^\W_](?>[a-z0-9-]*[^\W_])?)+$/
-    a
- 0: a
- 1: 
-    abc
- 0: abc
- 1: 
-    a-b
- 0: a-b
- 1: 
-    0-9 
- 0: 0-9
- 1: 
-    a.b
- 0: a.b
- 1: 
-    5.6.7  
- 0: 5.6.7
- 1: 
-    the.quick.brown.fox
- 0: the.quick.brown.fox
- 1: 
-    a100.b200.300c  
- 0: a100.b200.300c
- 1: 
-    12-ab.1245 
- 0: 12-ab.1245
- 1: 
-    ***Failers
-No match
-    \
-No match
-    .a
-No match
-    -a
-No match
-    a-
-No match
-    a.  
-No match
-    a_b 
-No match
-    a.-
-No match
-    a..  
-No match
-    ab..bc 
-No match
-    the.quick.brown.fox-
-No match
-    the.quick.brown.fox.
-No match
-    the.quick.brown.fox_
-No match
-    the.quick.brown.fox+       
-No match
-
-/(?>.*)(?<=(abcd|wxyz))/
-    alphabetabcd
- 0: alphabetabcd
- 1: abcd
-    endingwxyz
- 0: endingwxyz
- 1: wxyz
-    *** Failers
-No match
-    a rather long string that doesn't end with one of them
-No match
-
-/word (?>(?:(?!otherword)[a-zA-Z0-9]+ ){0,30})otherword/
-    word cat dog elephant mussel cow horse canary baboon snake shark otherword
- 0: word cat dog elephant mussel cow horse canary baboon snake shark otherword
-    word cat dog elephant mussel cow horse canary baboon snake shark
-No match
-  
-/word (?>[a-zA-Z0-9]+ ){0,30}otherword/
-    word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope
-No match
-
-/(?<=\d{3}(?!999))foo/
-    999foo
- 0: foo
-    123999foo 
- 0: foo
-    *** Failers
-No match
-    123abcfoo
-No match
-    
-/(?<=(?!...999)\d{3})foo/
-    999foo
- 0: foo
-    123999foo 
- 0: foo
-    *** Failers
-No match
-    123abcfoo
-No match
-
-/(?<=\d{3}(?!999)...)foo/
-    123abcfoo
- 0: foo
-    123456foo 
- 0: foo
-    *** Failers
-No match
-    123999foo  
-No match
-    
-/(?<=\d{3}...)(?<!999)foo/
-    123abcfoo   
- 0: foo
-    123456foo 
- 0: foo
-    *** Failers
-No match
-    123999foo  
-No match
-
-/<a[\s]+href[\s]*=[\s]*          # find <a href=
- ([\"\'])?                       # find single or double quote
- (?(1) (.*?)\1 | ([^\s]+))       # if quote found, match up to next matching
-                                 # quote, otherwise match up to next space
-/isx
-    <a href=abcd xyz
- 0: <a href=abcd
- 1: <unset>
- 2: <unset>
- 3: abcd
-    <a href=\"abcd xyz pqr\" cats
- 0: <a href="abcd xyz pqr"
- 1: "
- 2: abcd xyz pqr
-    <a href=\'abcd xyz pqr\' cats
- 0: <a href='abcd xyz pqr'
- 1: '
- 2: abcd xyz pqr
-
-/<a\s+href\s*=\s*                # find <a href=
- (["'])?                         # find single or double quote
- (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
-                                 # quote, otherwise match up to next space
-/isx
-    <a href=abcd xyz
- 0: <a href=abcd
- 1: <unset>
- 2: <unset>
- 3: abcd
-    <a href=\"abcd xyz pqr\" cats
- 0: <a href="abcd xyz pqr"
- 1: "
- 2: abcd xyz pqr
-    <a href       =       \'abcd xyz pqr\' cats
- 0: <a href       =       'abcd xyz pqr'
- 1: '
- 2: abcd xyz pqr
-
-/<a\s+href(?>\s*)=(?>\s*)        # find <a href=
- (["'])?                         # find single or double quote
- (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
-                                 # quote, otherwise match up to next space
-/isx
-    <a href=abcd xyz
- 0: <a href=abcd
- 1: <unset>
- 2: <unset>
- 3: abcd
-    <a href=\"abcd xyz pqr\" cats
- 0: <a href="abcd xyz pqr"
- 1: "
- 2: abcd xyz pqr
-    <a href       =       \'abcd xyz pqr\' cats
- 0: <a href       =       'abcd xyz pqr'
- 1: '
- 2: abcd xyz pqr
-
-/((Z)+|A)*/
-    ZABCDEFG
- 0: ZA
- 1: A
- 2: Z
-
-/(Z()|A)*/
-    ZABCDEFG
- 0: ZA
- 1: A
- 2: 
-
-/(Z(())|A)*/
-    ZABCDEFG
- 0: ZA
- 1: A
- 2: 
- 3: 
-
-/((?>Z)+|A)*/
-    ZABCDEFG
- 0: ZA
- 1: A
-
-/((?>)+|A)*/
-    ZABCDEFG
- 0: 
- 1: 
-
-/a*/g
-    abbab
- 0: a
- 0: 
- 0: 
- 0: a
- 0: 
- 0: 
-
-/^[a-\d]/
-    abcde
- 0: a
-    -things
- 0: -
-    0digit
- 0: 0
-    *** Failers
-No match
-    bcdef    
-No match
-
-/^[\d-a]/
-    abcde
- 0: a
-    -things
- 0: -
-    0digit
- 0: 0
-    *** Failers
+    École
+No match
+
+/École/i
+    École
+ 0: \xc9cole
+    *** Failers
+No match
+    école
+No match
+
+/École/iLfr
+    École
+ 0: École
+    école
+ 0: école
+
+/\w/IS
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+Study size = 40
+Starting character set: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P 
+  Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z 
+
+/\w/ISLfr
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+Study size = 40
+Starting character set: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P 
+  Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z 
+  À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö Ø Ù Ú Û Ü Ý Þ ß à á â ã ä å 
+  æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö ø ù ú û ü ý þ ÿ 
+
+/^[\xc8-\xc9]/iLfr
+    École
+ 0: É
+    école
+ 0: é
+
+/^[\xc8-\xc9]/Lfr
+    École
+ 0: É
+    *** Failers 
 No match
-    bcdef    
+    école
 No match
 
-/ End of testinput3 /       
+/ End of testinput3 /
 
diff --git a/testdata/testoutput4 b/testdata/testoutput4
index df81a0f..82c5e2a 100644
--- a/testdata/testoutput4
+++ b/testdata/testoutput4
@@ -1,115 +1,839 @@
-PCRE version 3.9 02-Jan-2002
+PCRE version 4.0 17-Feb-2003
 
-/^[\w]+/
+/-- Do not use the \x{} construct except with patterns that have the --/
+/-- /8 option set, because PCRE doesn't recognize them as UTF-8 unless --/
+No match
+/-- that option is set. However, the latest Perls recognize them always. --/
+No match
+
+/a.b/8
+    acb
+ 0: acb
+    a\x7fb
+ 0: a\x{7f}b
+    a\x{100}b 
+ 0: a\x{100}b
     *** Failers
 No match
-    École
+    a\nb  
+No match
+
+/a(.{3})b/8
+    a\x{4000}xyb 
+ 0: a\x{4000}xyb
+ 1: \x{4000}xy
+    a\x{4000}\x7fyb 
+ 0: a\x{4000}\x{7f}yb
+ 1: \x{4000}\x{7f}y
+    a\x{4000}\x{100}yb 
+ 0: a\x{4000}\x{100}yb
+ 1: \x{4000}\x{100}y
+    *** Failers
 No match
+    a\x{4000}b 
+No match
+    ac\ncb 
+No match
+
+/a(.*?)(.)/
+    a\xc0\x88b
+ 0: a\xc0
+ 1: 
+ 2: \xc0
+
+/a(.*?)(.)/8
+    a\x{100}b
+ 0: a\x{100}
+ 1: 
+ 2: \x{100}
+
+/a(.*)(.)/
+    a\xc0\x88b
+ 0: a\xc0\x88b
+ 1: \xc0\x88
+ 2: b
 
-/^[\w]+/Lfr
-    École
- 0: École
+/a(.*)(.)/8
+    a\x{100}b
+ 0: a\x{100}b
+ 1: \x{100}
+ 2: b
 
-/^[\w]+/
+/a(.)(.)/
+    a\xc0\x92bcd
+ 0: a\xc0\x92
+ 1: \xc0
+ 2: \x92
+
+/a(.)(.)/8
+    a\x{240}bcd
+ 0: a\x{240}b
+ 1: \x{240}
+ 2: b
+
+/a(.?)(.)/
+    a\xc0\x92bcd
+ 0: a\xc0\x92
+ 1: \xc0
+ 2: \x92
+
+/a(.?)(.)/8
+    a\x{240}bcd
+ 0: a\x{240}b
+ 1: \x{240}
+ 2: b
+
+/a(.??)(.)/
+    a\xc0\x92bcd
+ 0: a\xc0
+ 1: 
+ 2: \xc0
+
+/a(.??)(.)/8
+    a\x{240}bcd
+ 0: a\x{240}
+ 1: 
+ 2: \x{240}
+
+/a(.{3})b/8
+    a\x{1234}xyb 
+ 0: a\x{1234}xyb
+ 1: \x{1234}xy
+    a\x{1234}\x{4321}yb 
+ 0: a\x{1234}\x{4321}yb
+ 1: \x{1234}\x{4321}y
+    a\x{1234}\x{4321}\x{3412}b 
+ 0: a\x{1234}\x{4321}\x{3412}b
+ 1: \x{1234}\x{4321}\x{3412}
     *** Failers
 No match
-    École
+    a\x{1234}b 
+No match
+    ac\ncb 
 No match
 
-/^[\W]+/
-    École
- 0: \xc9
+/a(.{3,})b/8
+    a\x{1234}xyb 
+ 0: a\x{1234}xyb
+ 1: \x{1234}xy
+    a\x{1234}\x{4321}yb 
+ 0: a\x{1234}\x{4321}yb
+ 1: \x{1234}\x{4321}y
+    a\x{1234}\x{4321}\x{3412}b 
+ 0: a\x{1234}\x{4321}\x{3412}b
+ 1: \x{1234}\x{4321}\x{3412}
+    axxxxbcdefghijb 
+ 0: axxxxbcdefghijb
+ 1: xxxxbcdefghij
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+ 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
+ 1: \x{1234}\x{4321}\x{3412}\x{3421}
+    *** Failers
+No match
+    a\x{1234}b 
+No match
 
-/^[\W]+/Lfr
+/a(.{3,}?)b/8
+    a\x{1234}xyb 
+ 0: a\x{1234}xyb
+ 1: \x{1234}xy
+    a\x{1234}\x{4321}yb 
+ 0: a\x{1234}\x{4321}yb
+ 1: \x{1234}\x{4321}y
+    a\x{1234}\x{4321}\x{3412}b 
+ 0: a\x{1234}\x{4321}\x{3412}b
+ 1: \x{1234}\x{4321}\x{3412}
+    axxxxbcdefghijb 
+ 0: axxxxb
+ 1: xxxx
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+ 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
+ 1: \x{1234}\x{4321}\x{3412}\x{3421}
     *** Failers
- 0: *** 
-    École
+No match
+    a\x{1234}b 
 No match
 
-/[\b]/
-    \b
- 0: \x08
+/a(.{3,5})b/8
+    a\x{1234}xyb 
+ 0: a\x{1234}xyb
+ 1: \x{1234}xy
+    a\x{1234}\x{4321}yb 
+ 0: a\x{1234}\x{4321}yb
+ 1: \x{1234}\x{4321}y
+    a\x{1234}\x{4321}\x{3412}b 
+ 0: a\x{1234}\x{4321}\x{3412}b
+ 1: \x{1234}\x{4321}\x{3412}
+    axxxxbcdefghijb 
+ 0: axxxxb
+ 1: xxxx
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+ 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
+ 1: \x{1234}\x{4321}\x{3412}\x{3421}
+    axbxxbcdefghijb 
+ 0: axbxxb
+ 1: xbxx
+    axxxxxbcdefghijb 
+ 0: axxxxxb
+ 1: xxxxx
     *** Failers
 No match
-    a
+    a\x{1234}b 
+No match
+    axxxxxxbcdefghijb 
 No match
 
-/[\b]/Lfr
-    \b
- 0: \x08
+/a(.{3,5}?)b/8
+    a\x{1234}xyb 
+ 0: a\x{1234}xyb
+ 1: \x{1234}xy
+    a\x{1234}\x{4321}yb 
+ 0: a\x{1234}\x{4321}yb
+ 1: \x{1234}\x{4321}y
+    a\x{1234}\x{4321}\x{3412}b 
+ 0: a\x{1234}\x{4321}\x{3412}b
+ 1: \x{1234}\x{4321}\x{3412}
+    axxxxbcdefghijb 
+ 0: axxxxb
+ 1: xxxx
+    a\x{1234}\x{4321}\x{3412}\x{3421}b 
+ 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
+ 1: \x{1234}\x{4321}\x{3412}\x{3421}
+    axbxxbcdefghijb 
+ 0: axbxxb
+ 1: xbxx
+    axxxxxbcdefghijb 
+ 0: axxxxxb
+ 1: xxxxx
     *** Failers
 No match
-    a
+    a\x{1234}b 
+No match
+    axxxxxxbcdefghijb 
 No match
 
-/^\w+/
+/^[a\x{c0}]/8
     *** Failers
 No match
-    École
+    \x{100}
 No match
 
-/^\w+/Lfr
-    École
- 0: École
+/(?<=aXb)cd/8
+    aXbcd
+ 0: cd
 
-/(.+)\b(.+)/
-    École
- 0: \xc9cole
- 1: \xc9
- 2: cole
+/(?<=a\x{100}b)cd/8
+    a\x{100}bcd
+ 0: cd
+
+/(?<=a\x{100000}b)cd/8
+    a\x{100000}bcd
+ 0: cd
+    
+/(?:\x{100}){3}b/8
+    \x{100}\x{100}\x{100}b
+ 0: \x{100}\x{100}\x{100}b
+    *** Failers 
+No match
+    \x{100}\x{100}b
+No match
+
+/\x{ab}/8
+    \x{ab} 
+ 0: \x{ab}
+    \xc2\xab
+ 0: \x{ab}
+    *** Failers 
+No match
+    \x00{ab}
+No match
 
-/(.+)\b(.+)/Lfr
+/(?<=(.))X/8
+    WXYZ
+ 0: X
+ 1: W
+    \x{256}XYZ 
+ 0: X
+ 1: \x{256}
+    *** Failers
+No match
+    XYZ 
+No match
+
+/X(\C{3})/8
+    X\x{1234}
+ 0: X\x{1234}
+ 1: \x{1234}
+
+/X(\C{4})/8
+    X\x{1234}YZ
+ 0: X\x{1234}Y
+ 1: \x{1234}Y
+    
+/X\C*/8
+    XYZabcdce
+ 0: XYZabcdce
+    
+/X\C*?/8
+    XYZabcde
+ 0: X
+    
+/X\C{3,5}/8
+    Xabcdefg   
+ 0: Xabcde
+    X\x{1234} 
+ 0: X\x{1234}
+    X\x{1234}YZ
+ 0: X\x{1234}YZ
+    X\x{1234}\x{512}  
+ 0: X\x{1234}\x{512}
+    X\x{1234}\x{512}YZ
+ 0: X\x{1234}\x{512}
+
+/X\C{3,5}?/8
+    Xabcdefg   
+ 0: Xabc
+    X\x{1234} 
+ 0: X\x{1234}
+    X\x{1234}YZ
+ 0: X\x{1234}
+    X\x{1234}\x{512}  
+ 0: X\x{1234}
+
+/[^a]+/8g
+    bcd
+ 0: bcd
+    \x{100}aY\x{256}Z 
+ 0: \x{100}
+ 0: Y\x{256}Z
+    
+/^[^a]{2}/8
+    \x{100}bc
+ 0: \x{100}b
+ 
+/^[^a]{2,}/8
+    \x{100}bcAa
+ 0: \x{100}bcA
+
+/^[^a]{2,}?/8
+    \x{100}bca
+ 0: \x{100}b
+
+/[^a]+/8ig
+    bcd
+ 0: bcd
+    \x{100}aY\x{256}Z 
+ 0: \x{100}
+ 0: Y\x{256}Z
+    
+/^[^a]{2}/8i
+    \x{100}bc
+ 0: \x{100}b
+ 
+/^[^a]{2,}/8i
+    \x{100}bcAa
+ 0: \x{100}bc
+
+/^[^a]{2,}?/8i
+    \x{100}bca
+ 0: \x{100}b
+
+/\x{100}{0,0}/8
+    abcd
+ 0: 
+ 
+/\x{100}?/8
+    abcd
+ 0: 
+    \x{100}\x{100} 
+ 0: \x{100}
+
+/\x{100}{0,3}/8 
+    \x{100}\x{100} 
+ 0: \x{100}\x{100}
+    \x{100}\x{100}\x{100}\x{100} 
+ 0: \x{100}\x{100}\x{100}
+    
+/\x{100}*/8
+    abce
+ 0: 
+    \x{100}\x{100}\x{100}\x{100} 
+ 0: \x{100}\x{100}\x{100}\x{100}
+
+/\x{100}{1,1}/8
+    abcd\x{100}\x{100}\x{100}\x{100} 
+ 0: \x{100}
+
+/\x{100}{1,3}/8
+    abcd\x{100}\x{100}\x{100}\x{100} 
+ 0: \x{100}\x{100}\x{100}
+
+/\x{100}+/8
+    abcd\x{100}\x{100}\x{100}\x{100} 
+ 0: \x{100}\x{100}\x{100}\x{100}
+
+/\x{100}{3}/8
+    abcd\x{100}\x{100}\x{100}XX
+ 0: \x{100}\x{100}\x{100}
+
+/\x{100}{3,5}/8
+    abcd\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}XX
+ 0: \x{100}\x{100}\x{100}\x{100}\x{100}
+
+/\x{100}{3,}/8
+    abcd\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}XX
+ 0: \x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}
+
+/(?<=a\x{100}{2}b)X/8+
+    Xyyya\x{100}\x{100}bXzzz
+ 0: X
+ 0+ zzz
+
+/\D*/8
+  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+
+/\D*/8
+  \x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}
+ 0: \x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}\x{100}
+
+/\D/8
+    1X2
+ 0: X
+    1\x{100}2 
+ 0: \x{100}
+  
+/>\S/8
+    > >X Y
+ 0: >X
+    > >\x{100} Y
+ 0: >\x{100}
+  
+/\W/8
+    A.B
+ 0: .
+    A\x{100}B 
+ 0: \x{100}
+  
+/\d/8
+    \x{100}3
+ 0: 3
+    
+/\s/8
+    \x{100} X
+ 0:  
+    
+/\w/8
+    \x{100}X   
+ 0: X
+
+/\D+/8
+    12abcd34
+ 0: abcd
     *** Failers
  0: *** Failers
- 1: *** 
- 2: Failers
-    École
-No match
-
-/École/i
-    École
- 0: \xc9cole
-    *** Failers
-No match
-    école
-No match
-
-/École/iLfr
-    École
- 0: École
-    école
- 0: école
-
-/\w/IS
-Capturing subpattern count = 0
-No options
-No first char
-No need char
-Starting character set: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P 
-  Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z 
-
-/\w/ISLfr
-Capturing subpattern count = 0
-No options
-No first char
-No need char
-Starting character set: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P 
-  Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z 
-  À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö Ø Ù Ú Û Ü Ý Þ ß à á â ã ä å 
-  æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö ø ù ú û ü ý þ ÿ 
-
-/^[\xc8-\xc9]/iLfr
-    École
- 0: É
-    école
- 0: é
-
-/^[\xc8-\xc9]/Lfr
-    École
- 0: É
+    1234  
+No match
+
+/\D{2,3}/8
+    12abcd34
+ 0: abc
+    12ab34
+ 0: ab
+    *** Failers  
+ 0: ***
+    1234
+No match
+    12a34  
+No match
+
+/\D{2,3}?/8
+    12abcd34
+ 0: ab
+    12ab34
+ 0: ab
+    *** Failers  
+ 0: **
+    1234
+No match
+    12a34  
+No match
+
+/\d+/8
+    12abcd34
+ 0: 12
+    *** Failers
+No match
+
+/\d{2,3}/8
+    12abcd34
+ 0: 12
+    1234abcd
+ 0: 123
+    *** Failers  
+No match
+    1.4 
+No match
+
+/\d{2,3}?/8
+    12abcd34
+ 0: 12
+    1234abcd
+ 0: 12
+    *** Failers  
+No match
+    1.4 
+No match
+
+/\S+/8
+    12abcd34
+ 0: 12abcd34
+    *** Failers
+ 0: ***
+    \    \ 
+No match
+
+/\S{2,3}/8
+    12abcd34
+ 0: 12a
+    1234abcd
+ 0: 123
+    *** Failers
+ 0: ***
+    \     \  
+No match
+
+/\S{2,3}?/8
+    12abcd34
+ 0: 12
+    1234abcd
+ 0: 12
+    *** Failers
+ 0: **
+    \     \  
+No match
+
+/>\s+</8+
+    12>      <34
+ 0: >      <
+ 0+ 34
+    *** Failers
+No match
+
+/>\s{2,3}</8+
+    ab>  <cd
+ 0: >  <
+ 0+ cd
+    ab>   <ce
+ 0: >   <
+ 0+ ce
+    *** Failers
+No match
+    ab>    <cd 
+No match
+
+/>\s{2,3}?</8+
+    ab>  <cd
+ 0: >  <
+ 0+ cd
+    ab>   <ce
+ 0: >   <
+ 0+ ce
+    *** Failers
+No match
+    ab>    <cd 
+No match
+
+/\w+/8
+    12      34
+ 0: 12
+    *** Failers
+ 0: Failers
+    +++=*! 
+No match
+
+/\w{2,3}/8
+    ab  cd
+ 0: ab
+    abcd ce
+ 0: abc
+    *** Failers
+ 0: Fai
+    a.b.c
+No match
+
+/\w{2,3}?/8
+    ab  cd
+ 0: ab
+    abcd ce
+ 0: ab
+    *** Failers
+ 0: Fa
+    a.b.c
+No match
+
+/\W+/8
+    12====34
+ 0: ====
+    *** Failers
+ 0: *** 
+    abcd 
+No match
+
+/\W{2,3}/8
+    ab====cd
+ 0: ===
+    ab==cd
+ 0: ==
+    *** Failers
+ 0: ***
+    a.b.c
+No match
+
+/\W{2,3}?/8
+    ab====cd
+ 0: ==
+    ab==cd
+ 0: ==
+    *** Failers
+ 0: **
+    a.b.c
+No match
+
+/[\x{100}]/8
+    \x{100}
+ 0: \x{100}
+    Z\x{100}
+ 0: \x{100}
+    \x{100}Z
+ 0: \x{100}
+    *** Failers 
+No match
+
+/[Z\x{100}]/8
+    Z\x{100}
+ 0: Z
+    \x{100}
+ 0: \x{100}
+    \x{100}Z
+ 0: \x{100}
+    *** Failers 
+No match
+
+/[\x{100}\x{200}]/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   *** Failers  
+No match
+
+/[\x{100}-\x{200}]/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{111}cd 
+ 0: \x{111}
+   *** Failers  
+No match
+
+/[z-\x{200}]/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{111}cd 
+ 0: \x{111}
+   abzcd
+ 0: z
+   ab|cd  
+ 0: |
+   *** Failers  
+No match
+
+/[Q\x{100}\x{200}]/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   Q? 
+ 0: Q
+   *** Failers  
+No match
+
+/[Q\x{100}-\x{200}]/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{111}cd 
+ 0: \x{111}
+   Q? 
+ 0: Q
+   *** Failers  
+No match
+
+/[Qz-\x{200}]/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{111}cd 
+ 0: \x{111}
+   abzcd
+ 0: z
+   ab|cd  
+ 0: |
+   Q? 
+ 0: Q
+   *** Failers  
+No match
+
+/[\x{100}\x{200}]{1,3}/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{200}\x{100}\x{200}\x{100}cd
+ 0: \x{200}\x{100}\x{200}
+   *** Failers  
+No match
+
+/[\x{100}\x{200}]{1,3}?/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{200}\x{100}\x{200}\x{100}cd
+ 0: \x{200}
+   *** Failers  
+No match
+
+/[Q\x{100}\x{200}]{1,3}/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{200}\x{100}\x{200}\x{100}cd
+ 0: \x{200}\x{100}\x{200}
+   *** Failers  
+No match
+
+/[Q\x{100}\x{200}]{1,3}?/8
+   ab\x{100}cd
+ 0: \x{100}
+   ab\x{200}cd
+ 0: \x{200}
+   ab\x{200}\x{100}\x{200}\x{100}cd
+ 0: \x{200}
+   *** Failers  
+No match
+
+/(?<=[\x{100}\x{200}])X/8
+    abc\x{200}X
+ 0: X
+    abc\x{100}X 
+ 0: X
+    *** Failers
+No match
+    X  
+No match
+
+/(?<=[Q\x{100}\x{200}])X/8
+    abc\x{200}X
+ 0: X
+    abc\x{100}X 
+ 0: X
+    abQX 
+ 0: X
+    *** Failers
+No match
+    X  
+No match
+
+/(?<=[\x{100}\x{200}]{3})X/8
+    abc\x{100}\x{200}\x{100}X
+ 0: X
+    *** Failers
+No match
+    abc\x{200}X
+No match
+    X  
+No match
+
+/[^\x{100}\x{200}]X/8
+    AX
+ 0: AX
+    \x{150}X
+ 0: \x{150}X
+    \x{500}X 
+ 0: \x{500}X
+    *** Failers
+No match
+    \x{100}X
+No match
+    \x{200}X   
+No match
+
+/[^Q\x{100}\x{200}]X/8
+    AX
+ 0: AX
+    \x{150}X
+ 0: \x{150}X
+    \x{500}X 
+ 0: \x{500}X
+    *** Failers
+No match
+    \x{100}X
+No match
+    \x{200}X   
+No match
+    QX 
+No match
+
+/[^\x{100}-\x{200}]X/8
+    AX
+ 0: AX
+    \x{500}X 
+ 0: \x{500}X
+    *** Failers
+No match
+    \x{100}X
+No match
+    \x{150}X
+No match
+    \x{200}X   
+No match
+
+/a\Cb/
+    aXb
+ 0: aXb
+    a\nb
+ 0: a\x0ab
+  
+/a\Cb/8
+    aXb
+ 0: aXb
+    a\nb
+ 0: a\x{0a}b
     *** Failers 
 No match
-    école
+    a\x{100}b 
+No match
+
+/[z-\x{100}]/8i
+    z
+ 0: z
+    Z 
+ 0: Z
+    \x{100}
+ 0: \x{100}
+    *** Failers
+No match
+    \x{101}
+No match
+    y    
 No match
 
 / End of testinput4 /
diff --git a/testdata/testoutput5 b/testdata/testoutput5
index 6bb9ad3..3491576 100644
--- a/testdata/testoutput5
+++ b/testdata/testoutput5
@@ -1,242 +1,778 @@
-PCRE version 3.9 02-Jan-2002
+PCRE version 4.0 17-Feb-2003
 
-/-- Because of problems with Perl 5.6 in handling UTF-8 vs non UTF-8 --/
-/-- strings automatically, do not use the \x{} construct except with --/
-No match
-/-- patterns that have the /8 option set, and don't use them without! --/
-No match
+/\x{100}/8DM
+Memory allocation (code space): 11
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{100}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 196
+Need char = 128
 
-/a.b/8
-    acb
- 0: acb
-    a\x7fb
- 0: a\x{7f}b
-    a\x{100}b 
- 0: a\x{100}b
-    *** Failers
-No match
-    a\nb  
-No match
+/\x{1000}/8DM
+Memory allocation (code space): 12
+------------------------------------------------------------------
+  0   8 Bra 0
+  3   3 \x{1000}
+  8   8 Ket
+ 11     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 225
+Need char = 128
 
-/a(.{3})b/8
-    a\x{4000}xyb 
- 0: a\x{4000}xyb
- 1: \x{4000}xy
-    a\x{4000}\x7fyb 
- 0: a\x{4000}\x{7f}yb
- 1: \x{4000}\x{7f}y
-    a\x{4000}\x{100}yb 
- 0: a\x{4000}\x{100}yb
- 1: \x{4000}\x{100}y
-    *** Failers
-No match
-    a\x{4000}b 
+/\x{10000}/8DM
+Memory allocation (code space): 13
+------------------------------------------------------------------
+  0   9 Bra 0
+  3   4 \x{10000}
+  9   9 Ket
+ 12     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 240
+Need char = 128
+
+/\x{100000}/8DM
+Memory allocation (code space): 13
+------------------------------------------------------------------
+  0   9 Bra 0
+  3   4 \x{100000}
+  9   9 Ket
+ 12     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 244
+Need char = 128
+
+/\x{1000000}/8DM
+Memory allocation (code space): 14
+------------------------------------------------------------------
+  0  10 Bra 0
+  3   5 \x{1000000}
+ 10  10 Ket
+ 13     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 249
+Need char = 128
+
+/\x{4000000}/8DM
+Memory allocation (code space): 15
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   6 \x{4000000}
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 252
+Need char = 128
+
+/\x{7fffFFFF}/8DM
+Memory allocation (code space): 15
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   6 \x{7fffffff}
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 253
+Need char = 191
+
+/[\x{ff}]/8DM
+Memory allocation (code space): 40
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\xff]
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+
+/[\x{100}]/8DM
+Memory allocation (code space): 47
+------------------------------------------------------------------
+  0  11 Bra 0
+  3     [\x{100}]
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+
+/\x{ffffffff}/8
+Failed: character value in \x{...} sequence is too large at offset 11
+
+/\x{100000000}/8
+Failed: character value in \x{...} sequence is too large at offset 12
+
+/^\x{100}a\x{1234}/8
+    \x{100}a\x{1234}bcd
+ 0: \x{100}a\x{1234}
+
+/\x80/8D
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{80}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 194
+Need char = 128
+
+/\xff/8D
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{ff}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 195
+Need char = 191
+
+/\x{0041}\x{2262}\x{0391}\x{002e}/D8
+------------------------------------------------------------------
+  0  12 Bra 0
+  3   7 A\x{2262}\x{391}.
+ 12  12 Ket
+ 15     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 'A'
+Need char = '.'
+    \x{0041}\x{2262}\x{0391}\x{002e}
+ 0: A\x{2262}\x{391}.
+    
+/\x{D55c}\x{ad6d}\x{C5B4}/D8 
+------------------------------------------------------------------
+  0  14 Bra 0
+  3   9 \x{d55c}\x{ad6d}\x{c5b4}
+ 14  14 Ket
+ 17     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 237
+Need char = 180
+    \x{D55c}\x{ad6d}\x{C5B4} 
+ 0: \x{d55c}\x{ad6d}\x{c5b4}
+
+/\x{65e5}\x{672c}\x{8a9e}/D8
+------------------------------------------------------------------
+  0  14 Bra 0
+  3   9 \x{65e5}\x{672c}\x{8a9e}
+ 14  14 Ket
+ 17     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 230
+Need char = 158
+    \x{65e5}\x{672c}\x{8a9e}
+ 0: \x{65e5}\x{672c}\x{8a9e}
+
+/\x{80}/D8
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{80}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 194
+Need char = 128
+
+/\x{084}/D8
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{84}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 194
+Need char = 132
+
+/\x{104}/D8
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{104}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 196
+Need char = 132
+
+/\x{861}/D8
+------------------------------------------------------------------
+  0   8 Bra 0
+  3   3 \x{861}
+  8   8 Ket
+ 11     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 224
+Need char = 161
+
+/\x{212ab}/D8
+------------------------------------------------------------------
+  0   9 Bra 0
+  3   4 \x{212ab}
+  9   9 Ket
+ 12     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 240
+Need char = 171
+
+/.{3,5}X/D8
+------------------------------------------------------------------
+  0  14 Bra 0
+  3     Any{3}
+  7     Any{0,2}
+ 11   1 X
+ 14  14 Ket
+ 17     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+Need char = 'X'
+    \x{212ab}\x{212ab}\x{212ab}\x{861}X
+ 0: \x{212ab}\x{212ab}\x{212ab}\x{861}X
+
+
+/.{3,5}?/D8
+------------------------------------------------------------------
+  0  11 Bra 0
+  3     Any{3}
+  7     Any{0,2}?
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+    \x{212ab}\x{212ab}\x{212ab}\x{861}
+ 0: \x{212ab}\x{212ab}\x{212ab}
+
+/-- These tests are here rather than in testinput4 because Perl 5.6 has --/
+/-- some problems with UTF-8 support, in the area of \x{..} where the   --/
 No match
-    ac\ncb 
+/-- value is < 255. It grumbles about invalid UTF-8 strings.            --/
 No match
 
-/a(.*?)(.)/
-    a\xc0\x88b
- 0: a\xc0
- 1: 
- 2: \xc0
+/^[a\x{c0}]b/8
+    \x{c0}b
+ 0: \x{c0}b
+    
+/^([a\x{c0}]*?)aa/8
+    a\x{c0}aaaa/ 
+ 0: a\x{c0}aa
+ 1: a\x{c0}
 
-/a(.*?)(.)/8
-    a\x{100}b
- 0: a\x{100}
- 1: 
- 2: \x{100}
-
-/a(.*)(.)/
-    a\xc0\x88b
- 0: a\xc0\x88b
- 1: \xc0\x88
- 2: b
-
-/a(.*)(.)/8
-    a\x{100}b
- 0: a\x{100}b
- 1: \x{100}
- 2: b
-
-/a(.)(.)/
-    a\xc0\x92bcd
- 0: a\xc0\x92
- 1: \xc0
- 2: \x92
-
-/a(.)(.)/8
-    a\x{240}bcd
- 0: a\x{240}b
- 1: \x{240}
- 2: b
-
-/a(.?)(.)/
-    a\xc0\x92bcd
- 0: a\xc0\x92
- 1: \xc0
- 2: \x92
-
-/a(.?)(.)/8
-    a\x{240}bcd
- 0: a\x{240}b
- 1: \x{240}
- 2: b
-
-/a(.??)(.)/
-    a\xc0\x92bcd
- 0: a\xc0
- 1: 
- 2: \xc0
+/^([a\x{c0}]*?)aa/8
+    a\x{c0}aaaa/ 
+ 0: a\x{c0}aa
+ 1: a\x{c0}
+    a\x{c0}a\x{c0}aaa/ 
+ 0: a\x{c0}a\x{c0}aa
+ 1: a\x{c0}a\x{c0}
 
-/a(.??)(.)/8
-    a\x{240}bcd
- 0: a\x{240}
+/^([a\x{c0}]*)aa/8
+    a\x{c0}aaaa/ 
+ 0: a\x{c0}aaaa
+ 1: a\x{c0}aa
+    a\x{c0}a\x{c0}aaa/ 
+ 0: a\x{c0}a\x{c0}aaa
+ 1: a\x{c0}a\x{c0}a
+
+/^([a\x{c0}]*)a\x{c0}/8
+    a\x{c0}aaaa/ 
+ 0: a\x{c0}
  1: 
- 2: \x{240}
-
-/a(.{3})b/8
-    a\x{1234}xyb 
- 0: a\x{1234}xyb
- 1: \x{1234}xy
-    a\x{1234}\x{4321}yb 
- 0: a\x{1234}\x{4321}yb
- 1: \x{1234}\x{4321}y
-    a\x{1234}\x{4321}\x{3412}b 
- 0: a\x{1234}\x{4321}\x{3412}b
- 1: \x{1234}\x{4321}\x{3412}
-    *** Failers
-No match
-    a\x{1234}b 
-No match
-    ac\ncb 
-No match
-
-/a(.{3,})b/8
-    a\x{1234}xyb 
- 0: a\x{1234}xyb
- 1: \x{1234}xy
-    a\x{1234}\x{4321}yb 
- 0: a\x{1234}\x{4321}yb
- 1: \x{1234}\x{4321}y
-    a\x{1234}\x{4321}\x{3412}b 
- 0: a\x{1234}\x{4321}\x{3412}b
- 1: \x{1234}\x{4321}\x{3412}
-    axxxxbcdefghijb 
- 0: axxxxbcdefghijb
- 1: xxxxbcdefghij
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
- 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
- 1: \x{1234}\x{4321}\x{3412}\x{3421}
-    *** Failers
+    a\x{c0}a\x{c0}aaa/ 
+ 0: a\x{c0}a\x{c0}
+ 1: a\x{c0}
+    
+/-- --/ 
+    
+/(?<=\C)X/8
+Failed: \C not allowed in lookbehind assertion at offset 6
+
+/-- This one is here not because it's different to Perl, but because the --/
+/-- way the captured single-byte is displayed. (In Perl it becomes a --/
 No match
-    a\x{1234}b 
-No match
-
-/a(.{3,}?)b/8
-    a\x{1234}xyb 
- 0: a\x{1234}xyb
- 1: \x{1234}xy
-    a\x{1234}\x{4321}yb 
- 0: a\x{1234}\x{4321}yb
- 1: \x{1234}\x{4321}y
-    a\x{1234}\x{4321}\x{3412}b 
- 0: a\x{1234}\x{4321}\x{3412}b
- 1: \x{1234}\x{4321}\x{3412}
-    axxxxbcdefghijb 
- 0: axxxxb
- 1: xxxx
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
- 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
- 1: \x{1234}\x{4321}\x{3412}\x{3421}
-    *** Failers
+/-- character, and you can't tell the difference.) --/
 No match
-    a\x{1234}b 
-No match
-
-/a(.{3,5})b/8
-    a\x{1234}xyb 
- 0: a\x{1234}xyb
- 1: \x{1234}xy
-    a\x{1234}\x{4321}yb 
- 0: a\x{1234}\x{4321}yb
- 1: \x{1234}\x{4321}y
-    a\x{1234}\x{4321}\x{3412}b 
- 0: a\x{1234}\x{4321}\x{3412}b
- 1: \x{1234}\x{4321}\x{3412}
-    axxxxbcdefghijb 
- 0: axxxxb
- 1: xxxx
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
- 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
- 1: \x{1234}\x{4321}\x{3412}\x{3421}
-    axbxxbcdefghijb 
- 0: axbxxb
- 1: xbxx
-    axxxxxbcdefghijb 
- 0: axxxxxb
- 1: xxxxx
+    
+/X(\C)(.*)/8
+    X\x{1234}
+ 0: X\x{1234}
+ 1: \xe1
+ 2: \x88\xb4
+    X\nabc 
+ 0: X\x{0a}abc
+ 1: \x{0a}
+ 2: abc
+    
+/^[ab]/8D
+------------------------------------------------------------------
+  0  37 Bra 0
+  3     ^
+  4     [a-b]
+ 37  37 Ket
+ 40     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: anchored utf8
+No first char
+No need char
+    bar
+ 0: b
     *** Failers
 No match
-    a\x{1234}b 
-No match
-    axxxxxxbcdefghijb 
-No match
-
-/a(.{3,5}?)b/8
-    a\x{1234}xyb 
- 0: a\x{1234}xyb
- 1: \x{1234}xy
-    a\x{1234}\x{4321}yb 
- 0: a\x{1234}\x{4321}yb
- 1: \x{1234}\x{4321}y
-    a\x{1234}\x{4321}\x{3412}b 
- 0: a\x{1234}\x{4321}\x{3412}b
- 1: \x{1234}\x{4321}\x{3412}
-    axxxxbcdefghijb 
- 0: axxxxb
- 1: xxxx
-    a\x{1234}\x{4321}\x{3412}\x{3421}b 
- 0: a\x{1234}\x{4321}\x{3412}\x{3421}b
- 1: \x{1234}\x{4321}\x{3412}\x{3421}
-    axbxxbcdefghijb 
- 0: axbxxb
- 1: xbxx
-    axxxxxbcdefghijb 
- 0: axxxxxb
- 1: xxxxx
-    *** Failers
+    c
 No match
-    a\x{1234}b 
+    \x{ff}
 No match
-    axxxxxxbcdefghijb 
+    \x{100}  
 No match
 
-/^[a\x{c0}]/8
-    *** Failers
+/^[^ab]/8D
+------------------------------------------------------------------
+  0  37 Bra 0
+  3     ^
+  4     [\x00-`c-\xff] (neg)
+ 37  37 Ket
+ 40     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: anchored utf8
+No first char
+No need char
+    c
+ 0: c
+    \x{ff}
+ 0: \x{ff}
+    \x{100}  
+ 0: \x{100}
+    *** Failers 
+ 0: *
+    aaa
 No match
+  
+/[^ab\xC0-\xF0]/8SD
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x00-`c-\xbf\xf1-\xff] (neg)
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+Study size = 40
+Starting character set: \x00 \x01 \x02 \x03 \x04 \x05 \x06 \x07 \x08 \x09 \x0a 
+  \x0b \x0c \x0d \x0e \x0f \x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17 \x18 \x19 
+  \x1a \x1b \x1c \x1d \x1e \x1f \x20 ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 
+  5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y 
+  Z [ \ ] ^ _ ` c d e f g h i j k l m n o p q r s t u v w x y z { | } ~ \x7f 
+  \x80 \x81 \x82 \x83 \x84 \x85 \x86 \x87 \x88 \x89 \x8a \x8b \x8c \x8d \x8e 
+  \x8f \x90 \x91 \x92 \x93 \x94 \x95 \x96 \x97 \x98 \x99 \x9a \x9b \x9c \x9d 
+  \x9e \x9f \xa0 \xa1 \xa2 \xa3 \xa4 \xa5 \xa6 \xa7 \xa8 \xa9 \xaa \xab \xac 
+  \xad \xae \xaf \xb0 \xb1 \xb2 \xb3 \xb4 \xb5 \xb6 \xb7 \xb8 \xb9 \xba \xbb 
+  \xbc \xbd \xbe \xbf \xc0 \xc1 \xc2 \xc3 \xc4 \xc5 \xc6 \xc7 \xc8 \xc9 \xca 
+  \xcb \xcc \xcd \xce \xcf \xd0 \xd1 \xd2 \xd3 \xd4 \xd5 \xd6 \xd7 \xd8 \xd9 
+  \xda \xdb \xdc \xdd \xde \xdf \xe0 \xe1 \xe2 \xe3 \xe4 \xe5 \xe6 \xe7 \xe8 
+  \xe9 \xea \xeb \xec \xed \xee \xef \xf0 \xf1 \xf2 \xf3 \xf4 \xf5 \xf6 \xf7 
+  \xf8 \xf9 \xfa \xfb \xfc \xfd \xfe \xff 
+    \x{f1}
+ 0: \x{f1}
+    \x{bf}
+ 0: \x{bf}
     \x{100}
+ 0: \x{100}
+    \x{1000}   
+ 0: \x{1000}
+    *** Failers
+ 0: *
+    \x{c0} 
+No match
+    \x{f0} 
 No match
 
-/(?<=aXb)cd/8
-    aXbcd
- 0: cd
+/Ä€{3,4}/8SD
+------------------------------------------------------------------
+  0  13 Bra 0
+  3     \x{100}{3}
+  8     \x{100}{,1}
+ 13  13 Ket
+ 16     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 196
+Need char = 128
+Study returned NULL
+  \x{100}\x{100}\x{100}\x{100\x{100}
+ 0: \x{100}\x{100}\x{100}
 
-/(?<=a\x{100}b)cd/8
-    a\x{100}bcd
- 0: cd
+/(\x{100}+|x)/8SD
+------------------------------------------------------------------
+  0  18 Bra 0
+  3   6 Bra 1
+  6     \x{100}+
+  9   6 Alt
+ 12   1 x
+ 15  12 Ket
+ 18  18 Ket
+ 21     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Options: utf8
+No first char
+No need char
+Study size = 40
+Starting character set: x \xc4 
 
-/(?<=a\x{100000}b)cd/8
-    a\x{100000}bcd
- 0: cd
-    
-/(?:\x{100}){3}b/8
-    \x{100}\x{100}\x{100}b
- 0: \x{100}\x{100}\x{100}b
+/(\x{100}*a|x)/8SD
+------------------------------------------------------------------
+  0  21 Bra 0
+  3   9 Bra 1
+  6     \x{100}*
+  9   1 a
+ 12   6 Alt
+ 15   1 x
+ 18  15 Ket
+ 21  21 Ket
+ 24     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Options: utf8
+No first char
+No need char
+Study size = 40
+Starting character set: a x \xc4 
+
+/(\x{100}{0,2}a|x)/8SD
+------------------------------------------------------------------
+  0  23 Bra 0
+  3  11 Bra 1
+  6     \x{100}{,2}
+ 11   1 a
+ 14   6 Alt
+ 17   1 x
+ 20  17 Ket
+ 23  23 Ket
+ 26     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Options: utf8
+No first char
+No need char
+Study size = 40
+Starting character set: a x \xc4 
+
+/(\x{100}{1,2}a|x)/8SD
+------------------------------------------------------------------
+  0  27 Bra 0
+  3  15 Bra 1
+  6   2 \x{100}
+ 10     \x{100}{,1}
+ 15   1 a
+ 18   6 Alt
+ 21   1 x
+ 24  21 Ket
+ 27  27 Ket
+ 30     End
+------------------------------------------------------------------
+Capturing subpattern count = 1
+Options: utf8
+No first char
+No need char
+Study size = 40
+Starting character set: x \xc4 
+
+/\x{100}*(\d+|"(?1)")/8
+    1234
+ 0: 1234
+ 1: 1234
+    "1234" 
+ 0: "1234"
+ 1: "1234"
+    \x{100}1234
+ 0: \x{100}1234
+ 1: 1234
+    "\x{100}1234"  
+ 0: \x{100}1234
+ 1: 1234
+    \x{100}\x{100}12ab 
+ 0: \x{100}\x{100}12
+ 1: 12
+    \x{100}\x{100}"12" 
+ 0: \x{100}\x{100}"12"
+ 1: "12"
     *** Failers 
 No match
-    \x{100}\x{100}b
+    \x{100}\x{100}abcd
 No match
 
+/\x{100}/8D
+------------------------------------------------------------------
+  0   7 Bra 0
+  3   2 \x{100}
+  7   7 Ket
+ 10     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 196
+Need char = 128
+
+/\x{100}*/8D
+------------------------------------------------------------------
+  0   6 Bra 0
+  3     \x{100}*
+  6   6 Ket
+  9     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+
+/a\x{100}*/8D
+------------------------------------------------------------------
+  0   9 Bra 0
+  3   1 a
+  6     \x{100}*
+  9   9 Ket
+ 12     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 'a'
+No need char
+
+/ab\x{100}*/8D
+------------------------------------------------------------------
+  0  10 Bra 0
+  3   2 ab
+  7     \x{100}*
+ 10  10 Ket
+ 13     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 'a'
+Need char = 'b'
+
+/a\x{100}\x{101}*/8D
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   3 a\x{100}
+  8     \x{101}*
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 'a'
+Need char = 128
+
+/a\x{100}\x{101}+/8D
+------------------------------------------------------------------
+  0  11 Bra 0
+  3   3 a\x{100}
+  8     \x{101}+
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+First char = 'a'
+Need char = 129
+
+/\x{100}*A/8D
+------------------------------------------------------------------
+  0   9 Bra 0
+  3     \x{100}*
+  6   1 A
+  9   9 Ket
+ 12     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+Need char = 'A'
+    A
+ 0: A
+
+/\x{100}*\d(?R)/8D
+------------------------------------------------------------------
+  0  10 Bra 0
+  3     \x{100}*
+  6     \d
+  7   0 Recurse
+ 10  10 Ket
+ 13     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+
+/[^\x{c4}]/D
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x01-35-bd-z|~-\xff] (neg)
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+No options
+No first char
+No need char
+
+/[^\x{c4}]/8D
+------------------------------------------------------------------
+  0  36 Bra 0
+  3     [\x00-\xc3\xc5-\xff] (neg)
+ 36  36 Ket
+ 39     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+
+/[\x{100}]/8DM
+Memory allocation (code space): 47
+------------------------------------------------------------------
+  0  11 Bra 0
+  3     [\x{100}]
+ 11  11 Ket
+ 14     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+    \x{100}
+ 0: \x{100}
+    Z\x{100}
+ 0: \x{100}
+    \x{100}Z
+ 0: \x{100}
+    *** Failers 
+No match
+
+/[Z\x{100}]/8DM
+Memory allocation (code space): 47
+------------------------------------------------------------------
+  0  43 Bra 0
+  3     [Z\x{100}]
+ 43  43 Ket
+ 46     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+    Z\x{100}
+ 0: Z
+    \x{100}
+ 0: \x{100}
+    \x{100}Z
+ 0: \x{100}
+    *** Failers 
+No match
+
+/[\x{200}-\x{100}]/8
+Failed: range out of order in character class at offset 15
+
+/[Ä€-Ä„]/8
+    \x{100}
+ 0: \x{100}
+    \x{104}
+ 0: \x{104}
+    *** Failers
+No match
+    \x{105}
+No match
+    \x{ff}    
+No match
+
+/[z-\x{100}]/8D
+------------------------------------------------------------------
+  0  12 Bra 0
+  3     [z-\x{100}]
+ 12  12 Ket
+ 15     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+
+/[z-\x{100}]/8Di
+------------------------------------------------------------------
+  0  45 Bra 0
+  3     [Zz-\xff\x{100}-\x{100}]
+ 45  45 Ket
+ 48     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: caseless utf8
+No first char
+No need char
+
+/[z\Qa-d]Ä€\E]/8D
+------------------------------------------------------------------
+  0  43 Bra 0
+  3     [\-\]adz\x{100}]
+ 43  43 Ket
+ 46     End
+------------------------------------------------------------------
+Capturing subpattern count = 0
+Options: utf8
+No first char
+No need char
+    \x{100}
+ 0: \x{100}
+    Ā 
+ 0: \x{100}
+
 / End of testinput5 /
 
diff --git a/testdata/testoutput6 b/testdata/testoutput6
deleted file mode 100644
index fcf0846..0000000
--- a/testdata/testoutput6
+++ /dev/null
@@ -1,319 +0,0 @@
-PCRE version 3.9 02-Jan-2002
-
-/\x{100}/8DM
-Memory allocation (code space): 11
-------------------------------------------------------------------
-  0   7 Bra 0
-  3   2 \xc4\x80
-  7   7 Ket
- 10     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 196
-Need char = 128
-
-/\x{1000}/8DM
-Memory allocation (code space): 12
-------------------------------------------------------------------
-  0   8 Bra 0
-  3   3 \xe1\x80\x80
-  8   8 Ket
- 11     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 225
-Need char = 128
-
-/\x{10000}/8DM
-Memory allocation (code space): 13
-------------------------------------------------------------------
-  0   9 Bra 0
-  3   4 \xf0\x90\x80\x80
-  9   9 Ket
- 12     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 240
-Need char = 128
-
-/\x{100000}/8DM
-Memory allocation (code space): 13
-------------------------------------------------------------------
-  0   9 Bra 0
-  3   4 \xf4\x80\x80\x80
-  9   9 Ket
- 12     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 244
-Need char = 128
-
-/\x{1000000}/8DM
-Memory allocation (code space): 14
-------------------------------------------------------------------
-  0  10 Bra 0
-  3   5 \xf9\x80\x80\x80\x80
- 10  10 Ket
- 13     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 249
-Need char = 128
-
-/\x{4000000}/8DM
-Memory allocation (code space): 15
-------------------------------------------------------------------
-  0  11 Bra 0
-  3   6 \xfc\x84\x80\x80\x80\x80
- 11  11 Ket
- 14     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 252
-Need char = 128
-
-/\x{7fffFFFF}/8DM
-Memory allocation (code space): 15
-------------------------------------------------------------------
-  0  11 Bra 0
-  3   6 \xfd\xbf\xbf\xbf\xbf\xbf
- 11  11 Ket
- 14     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 253
-Need char = 191
-
-/[\x{ff}]/8DM
-Memory allocation (code space): 40
-------------------------------------------------------------------
-  0   6 Bra 0
-  3   1 \xff
-  6   6 Ket
-  9     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 255
-No need char
-
-/[\x{100}]/8DM
-Memory allocation (code space): 40
-Failed: characters with values > 255 are not yet supported in classes at offset 7
-
-/\x{ffffffff}/8
-Failed: character value in \x{...} sequence is too large at offset 11
-
-/\x{100000000}/8
-Failed: character value in \x{...} sequence is too large at offset 12
-
-/^\x{100}a\x{1234}/8
-    \x{100}a\x{1234}bcd
- 0: \x{100}a\x{1234}
-
-/\x80/8D
-------------------------------------------------------------------
-  0   7 Bra 0
-  3   2 \xc2\x80
-  7   7 Ket
- 10     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 194
-Need char = 128
-
-/\xff/8D
-------------------------------------------------------------------
-  0   7 Bra 0
-  3   2 \xc3\xbf
-  7   7 Ket
- 10     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 195
-Need char = 191
-
-/\x{0041}\x{2262}\x{0391}\x{002e}/D8
-------------------------------------------------------------------
-  0  12 Bra 0
-  3   7 A\xe2\x89\xa2\xce\x91.
- 12  12 Ket
- 15     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 'A'
-Need char = '.'
-    \x{0041}\x{2262}\x{0391}\x{002e}
- 0: A\x{2262}\x{391}.
-    
-/\x{D55c}\x{ad6d}\x{C5B4}/D8 
-------------------------------------------------------------------
-  0  14 Bra 0
-  3   9 \xed\x95\x9c\xea\xb5\xad\xec\x96\xb4
- 14  14 Ket
- 17     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 237
-Need char = 180
-    \x{D55c}\x{ad6d}\x{C5B4} 
- 0: \x{d55c}\x{ad6d}\x{c5b4}
-
-/\x{65e5}\x{672c}\x{8a9e}/D8
-------------------------------------------------------------------
-  0  14 Bra 0
-  3   9 \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e
- 14  14 Ket
- 17     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 230
-Need char = 158
-    \x{65e5}\x{672c}\x{8a9e}
- 0: \x{65e5}\x{672c}\x{8a9e}
-
-/\x{80}/D8
-------------------------------------------------------------------
-  0   7 Bra 0
-  3   2 \xc2\x80
-  7   7 Ket
- 10     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 194
-Need char = 128
-
-/\x{084}/D8
-------------------------------------------------------------------
-  0   7 Bra 0
-  3   2 \xc2\x84
-  7   7 Ket
- 10     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 194
-Need char = 132
-
-/\x{104}/D8
-------------------------------------------------------------------
-  0   7 Bra 0
-  3   2 \xc4\x84
-  7   7 Ket
- 10     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 196
-Need char = 132
-
-/\x{861}/D8
-------------------------------------------------------------------
-  0   8 Bra 0
-  3   3 \xe0\xa1\xa1
-  8   8 Ket
- 11     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 224
-Need char = 161
-
-/\x{212ab}/D8
-------------------------------------------------------------------
-  0   9 Bra 0
-  3   4 \xf0\xa1\x8a\xab
-  9   9 Ket
- 12     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 240
-Need char = 171
-
-/.{3,5}X/D8
-------------------------------------------------------------------
-  0  14 Bra 0
-  3     Any{3}
-  7     Any{0,2}
- 11   1 X
- 14  14 Ket
- 17     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-No first char
-Need char = 'X'
-    \x{212ab}\x{212ab}\x{212ab}\x{861}X
- 0: \x{212ab}\x{212ab}\x{212ab}\x{861}X
-
-
-/.{3,5}?/D8
-------------------------------------------------------------------
-  0  11 Bra 0
-  3     Any{3}
-  7     Any{0,2}?
- 11  11 Ket
- 14     End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-No first char
-No need char
-    \x{212ab}\x{212ab}\x{212ab}\x{861}
- 0: \x{212ab}\x{212ab}\x{212ab}
-
-/-- These tests are here rather than in testinput5 because Perl 5.6 has --/
-/-- some problems with UTF-8 support, in the area of \x{..} where the   --/
-No match
-/-- value is < 255. It grumbles about invalid UTF-8 strings.            --/
-No match
-
-/^[a\x{c0}]b/8
-    \x{c0}b
- 0: \x{c0}b
-    
-/^([a\x{c0}]*?)aa/8
-    a\x{c0}aaaa/ 
- 0: a\x{c0}aa
- 1: a\x{c0}
-
-/^([a\x{c0}]*?)aa/8
-    a\x{c0}aaaa/ 
- 0: a\x{c0}aa
- 1: a\x{c0}
-    a\x{c0}a\x{c0}aaa/ 
- 0: a\x{c0}a\x{c0}aa
- 1: a\x{c0}a\x{c0}
-
-/^([a\x{c0}]*)aa/8
-    a\x{c0}aaaa/ 
- 0: a\x{c0}aaaa
- 1: a\x{c0}aa
-    a\x{c0}a\x{c0}aaa/ 
- 0: a\x{c0}a\x{c0}aaa
- 1: a\x{c0}a\x{c0}a
-
-/^([a\x{c0}]*)a\x{c0}/8
-    a\x{c0}aaaa/ 
- 0: a\x{c0}
- 1: 
-    a\x{c0}a\x{c0}aaa/ 
- 0: a\x{c0}a\x{c0}
- 1: a\x{c0}
-
-/ End of testinput6 /
-