Give errors for [A-\d] and [a-[:digit:]] etc.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1392 2f5784b3-3f2a-0410-8824-cb99058d5e15

3 files changed, 19 insertions, 5 deletions

diff --git a/doc/pcreapi.3 b/doc/pcreapi.3
index ed71b77..feabfb3 100644
--- a/doc/pcreapi.3
+++ b/doc/pcreapi.3
@@ -978,6 +978,8 @@ have fallen out of use. To avoid confusion, they have not been re-used.
   79  non-hex character in \ex{} (closing brace missing?)
   80  non-octal character in \eo{} (closing brace missing?)
   81  missing opening brace after \eo 
+  82  parentheses are too deeply nested
+  83  invalid range in character class
 .sp
 The numbers 32 and 10000 in errors 48 and 49 are defaults; different values may
 be used if the limits were changed when PCRE was built.
diff --git a/doc/pcrecompat.3 b/doc/pcrecompat.3
index 2c109ea..1f12cd3 100644
--- a/doc/pcrecompat.3
+++ b/doc/pcrecompat.3
@@ -1,4 +1,4 @@
-.TH PCRECOMPAT 3 "19 March 2013" "PCRE 8.33"
+.TH PCRECOMPAT 3 "05 November 2013" "PCRE 8.34"
 .SH NAME
 PCRE - Perl-compatible regular expressions
 .SH "DIFFERENCES BETWEEN PCRE AND PERL"
@@ -125,13 +125,18 @@ between the ( and ? at the start of a subpattern. If the /x modifier is set,
 Perl allows white space between ( and ? but PCRE never does, even if the
 PCRE_EXTENDED option is set.
 .P
-16. In PCRE, the upper/lower case character properties Lu and Ll are not
+16. Perl, when in warning mode, gives warnings for character classes such as
+[A-\ed] or [a-[:digit:]]. It then treats the hyphens as literals. PCRE has no 
+warning features, so it gives an error in these cases because they are almost 
+certainly user mistakes.
+.P
+17. In PCRE, the upper/lower case character properties Lu and Ll are not
 affected when case-independent matching is specified. For example, \ep{Lu}
 always matches an upper case letter. I think Perl has changed in this respect;
 in the release at the time of writing (5.16), \ep{Lu} and \ep{Ll} match all
 letters, regardless of case, when case independence is specified.
 .P
-17. PCRE provides some extensions to the Perl regular expression facilities.
+18. PCRE provides some extensions to the Perl regular expression facilities.
 Perl 5.10 includes new features that are not in earlier versions of Perl, some
 of which (such as named parentheses) have been in PCRE for some time. This list
 is with respect to Perl 5.10:
@@ -190,6 +195,6 @@ Cambridge CB2 3QH, England.
 .rs
 .sp
 .nf
-Last updated: 19 March 2013
+Last updated: 05 November 2013
 Copyright (c) 1997-2013 University of Cambridge.
 .fi
diff --git a/doc/pcrepattern.3 b/doc/pcrepattern.3
index 9eca02c..550ea15 100644
--- a/doc/pcrepattern.3
+++ b/doc/pcrepattern.3
@@ -1235,7 +1235,9 @@ The minus (hyphen) character can be used to specify a range of characters in a
 character class. For example, [d-m] matches any letter between d and m,
 inclusive. If a minus character is required in a class, it must be escaped with
 a backslash or appear in a position where it cannot be interpreted as
-indicating a range, typically as the first or last character in the class.
+indicating a range, typically as the first or last character in the class, or 
+immediately after a range. For example, [b-d-z] matches letters in the range b
+to d, a hyphen character, or z.
 .P
 It is not possible to have the literal character "]" as the end character of a
 range. A pattern such as [W-]46] is interpreted as a class of two characters
@@ -1245,6 +1247,11 @@ the end of range, so [W-\e]46] is interpreted as a class containing a range
 followed by two other characters. The octal or hexadecimal representation of
 "]" can also be used to end a range.
 .P
+An error is generated if a POSIX character class (see below) or an escape
+sequence other than one that defines a single character appears at a point
+where a range ending character is expected. For example, [z-\exff] is valid,
+but [A-\ed] and [A-[:digit:]] are not.
+.P
 Ranges operate in the collating sequence of character values. They can also be
 used for characters specified numerically, for example [\e000-\e037]. Ranges
 can include any characters that are valid for the current mode.