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Documentation update.

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Philip.Hazel 2020-10-05 16:52:39 +00:00
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15
doc/pcre2api.3
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@ -1,4 +1,4 @@
.TH PCRE2API 3 "19 March 2020" "PCRE2 10.35"
.TH PCRE2API 3 "05 October 2020" "PCRE2 10.36"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.sp
@ -1434,10 +1434,13 @@ letters in the subject. It is equivalent to Perl's /i option, and it can be
changed within a pattern by a (?i) option setting. If either PCRE2_UTF or
PCRE2_UCP is set, Unicode properties are used for all characters with more than
one other case, and for all characters whose code points are greater than
U+007F. For lower valued characters with only one other case, a lookup table is
used for speed. When neither PCRE2_UTF nor PCRE2_UCP is set, a lookup table is
used for all code points less than 256, and higher code points (available only
in 16-bit or 32-bit mode) are treated as not having another case.
U+007F. Note that there are two ASCII characters, K and S, that, in addition to
their lower case ASCII equivalents, are case-equivalent with U+212A (Kelvin
sign) and U+017F (long S) respectively. For lower valued characters with only
one other case, a lookup table is used for speed. When neither PCRE2_UTF nor
PCRE2_UCP is set, a lookup table is used for all code points less than 256, and
higher code points (available only in 16-bit or 32-bit mode) are treated as not
having another case.
.sp
PCRE2_DOLLAR_ENDONLY
.sp
@ -3968,6 +3971,6 @@ Cambridge, England.
.rs
.sp
.nf
Last updated: 19 March 2020
Last updated: 05 October 2020
Copyright (c) 1997-2020 University of Cambridge.
.fi

44
doc/pcre2pattern.3
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@ -1,4 +1,4 @@
.TH PCRE2PATTERN 3 "24 February 2020" "PCRE2 10.35"
.TH PCRE2PATTERN 3 "05 October 2020" "PCRE2 10.35"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.SH "PCRE2 REGULAR EXPRESSION DETAILS"
@ -263,8 +263,11 @@ corresponding characters in the subject. As a trivial example, the pattern
The quick brown fox
.sp
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
The power of regular expressions comes from the ability to include wild cards,
character classes, alternatives, and repetitions in the pattern. These are
@ -298,6 +301,22 @@ a character class the only metacharacters are:
[ POSIX character class (if followed by POSIX syntax)
] terminates the character class
.sp
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
.\" HTML <a href="#internaloptions">
.\" </a>
"Internal Option Setting"
.\"
below.
.P
The following sections describe the use of each of the metacharacters.
.
.
@ -315,15 +334,9 @@ would otherwise be interpreted as a metacharacter, so it is always safe to
precede a non-alphanumeric with backslash to specify that it stands for itself.
In particular, if you want to match a backslash, you write \e\e.
.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
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
If you want to treat all characters in a sequence as literals, you can do so by
putting them between \eQ and \eE. This is different from Perl in that $ and @
@ -1436,7 +1449,10 @@ Characters in a class may be specified by their code points using \eo, \ex, or
\eN{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
Characters that might indicate line breaks are never treated in any special way
when matching character classes, whatever line-ending sequence is in use, and
@ -3881,6 +3897,6 @@ Cambridge, England.
.rs
.sp
.nf
Last updated: 24 February 2020
Last updated: 05 October 2020
Copyright (c) 1997-2020 University of Cambridge.
.fi