1 files changed, 30 insertions, 16 deletions
diff --git a/doc/html/pcre2pattern.html b/doc/html/pcre2pattern.html
index ec2e8c9..b2adf98 100644
--- a/doc/html/pcre2pattern.html
+++ b/doc/html/pcre2pattern.html
@@ -289,8 +289,11 @@ corresponding characters in the subject. As a trivial example, the pattern
   The quick brown fox
 </pre>
 matches a portion of a subject string that is identical to itself. When
-caseless matching is specified (the PCRE2_CASELESS option), letters are matched
-independently of case.
+caseless matching is specified (the PCRE2_CASELESS option or (?i) within the
+pattern), letters are matched independently of case. Note that there are two
+ASCII characters, K and S, that, in addition to their lower case ASCII
+equivalents, are case-equivalent with Unicode U+212A (Kelvin sign) and U+017F
+(long S) respectively when either PCRE2_UTF or PCRE2_UCP is set.
 </P>
 <P>
 The power of regular expressions comes from the ability to include wild cards,
@@ -326,6 +329,20 @@ a character class the only metacharacters are:
   [      POSIX character class (if followed by POSIX syntax)
   ]      terminates the character class
 </pre>
+If a pattern is compiled with the PCRE2_EXTENDED option, most white space in
+the pattern, other than in a character class, and characters between a #
+outside a character class and the next newline, inclusive, are ignored. An
+escaping backslash can be used to include a white space or a # character as
+part of the pattern. If the PCRE2_EXTENDED_MORE option is set, the same
+applies, but in addition unescaped space and horizontal tab characters are
+ignored inside a character class. Note: only these two characters are ignored,
+not the full set of pattern white space characters that are ignored outside a
+character class. Option settings can be changed within a pattern; see the 
+section entitled
+<a href="#internaloptions">"Internal Option Setting"</a>
+below.
+</P>
+<P>
 The following sections describe the use of each of the metacharacters.
 </P>
 <br><a name="SEC5" href="#TOC1">BACKSLASH</a><br>
@@ -343,16 +360,9 @@ precede a non-alphanumeric with backslash to specify that it stands for itself.
 In particular, if you want to match a backslash, you write \\.
 </P>
 <P>
-In a UTF mode, only ASCII digits and letters have any special meaning after a
-backslash. All other characters (in particular, those whose code points are
-greater than 127) are treated as literals.
-</P>
-<P>
-If a pattern is compiled with the PCRE2_EXTENDED option, most white space in
-the pattern (other than in a character class), and characters between a #
-outside a character class and the next newline, inclusive, are ignored. An
-escaping backslash can be used to include a white space or # character as part
-of the pattern.
+Only ASCII digits and letters have any special meaning after a backslash. All
+other characters (in particular, those whose code points are greater than 127)
+are treated as literals.
 </P>
 <P>
 If you want to treat all characters in a sequence as literals, you can do so by
@@ -1165,8 +1175,9 @@ For example, when the pattern
 matches "foobar", the first substring is still set to "foo".
 </P>
 <P>
-Perl documents that the use of \K within assertions is "not well defined". In
-PCRE2, \K is acted upon when it occurs inside positive assertions, but is
+Perl used to document that the use of \K within lookaround assertions is "not
+well defined", but from version 5.32.0 Perl does not support this usage at all.
+In PCRE2, \K is acted upon when it occurs inside positive assertions, but is
 ignored in negative assertions. Note that when a pattern such as (?=ab\K)
 matches, the reported start of the match can be greater than the end of the
 match. Using \K in a lookbehind assertion at the start of a pattern can also
@@ -1443,7 +1454,10 @@ Characters in a class may be specified by their code points using \o, \x, or
 \N{U+hh..} in the usual way. When caseless matching is set, any letters in a
 class represent both their upper case and lower case versions, so for example,
 a caseless [aeiou] matches "A" as well as "a", and a caseless [^aeiou] does not
-match "A", whereas a caseful version would.
+match "A", whereas a caseful version would. Note that there are two ASCII
+characters, K and S, that, in addition to their lower case ASCII equivalents,
+are case-equivalent with Unicode U+212A (Kelvin sign) and U+017F (long S)
+respectively when either PCRE2_UTF or PCRE2_UCP is set.
 </P>
 <P>
 Characters that might indicate line breaks are never treated in any special way
@@ -3838,7 +3852,7 @@ Cambridge, England.
 </P>
 <br><a name="SEC32" href="#TOC1">REVISION</a><br>
 <P>
-Last updated: 24 February 2020
+Last updated: 06 October 2020
 <br>
 Copyright &copy; 1997-2020 University of Cambridge.
 <br>