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version 1.1.1.1, 2012/02/21 23:05:52	version 1.1.1.3, 2012/10/09 09:19:17
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.TH PCRECOMPAT 3	.TH PCRECOMPAT 3 "08 January 2012" "PCRE 8.30"
.SH NAME	.SH NAME
PCRE - Perl-compatible regular expressions	PCRE - Perl-compatible regular expressions
.SH "DIFFERENCES BETWEEN PCRE AND PERL"	.SH "DIFFERENCES BETWEEN PCRE AND PERL"
Line 8 This document describes the differences in the ways th	Line 8 This document describes the differences in the ways th
regular expressions. The differences described here are with respect to Perl	regular expressions. The differences described here are with respect to Perl
versions 5.10 and above.	versions 5.10 and above.
.P	.P
1. PCRE has only a subset of Perl's UTF-8 and Unicode support. Details of what	1. PCRE has only a subset of Perl's Unicode support. Details of what it does
it does have are given in the	have are given in the
.\" HREF	.\" HREF
\fBpcreunicode\fP	\fBpcreunicode\fP
.\"	.\"
Line 95 in the	Line 95 in the
.\"	.\"
page.	page.
.P	.P
11. If (*THEN) is present in a group that is called as a subroutine, its action	11. If any of the backtracking control verbs are used in an assertion or in a
is limited to that group, even if the group does not contain any \| characters.	subpattern that is called as a subroutine (whether or not recursively), their
	effect is confined to that subpattern; it does not extend to the surrounding
	pattern. This is not always the case in Perl. In particular, if (*THEN) is
	present in a group that is called as a subroutine, its action is limited to
	that group, even if the group does not contain any \| characters. There is one
	exception to this: the name from a (MARK), (PRUNE), or (*THEN) that is
	encountered in a successful positive assertion \fIis\fP passed back when a
	match succeeds (compare capturing parentheses in assertions). Note that such
	subpatterns are processed as anchored at the point where they are tested.
.P	.P
12. There are some differences that are concerned with the settings of captured	12. There are some differences that are concerned with the settings of captured
strings when part of a pattern is repeated. For example, matching "aba" against	strings when part of a pattern is repeated. For example, matching "aba" against
Line 114 an error is given at compile time.	Line 122 an error is given at compile time.
.P	.P
14. Perl recognizes comments in some places that PCRE does not, for example,	14. Perl recognizes comments in some places that PCRE does not, for example,
between the ( and ? at the start of a subpattern. If the /x modifier is set,	between the ( and ? at the start of a subpattern. If the /x modifier is set,
Perl allows whitespace between ( and ? but PCRE never does, even if the	Perl allows white space between ( and ? but PCRE never does, even if the
PCRE_EXTENDED option is set.	PCRE_EXTENDED option is set.
.P	.P
15. PCRE provides some extensions to the Perl regular expression facilities.	15. PCRE provides some extensions to the Perl regular expression facilities.
Line 154 by the PCRE_BSR_ANYCRLF option.	Line 162 by the PCRE_BSR_ANYCRLF option.
different hosts that have the other endianness. However, this does not apply to	different hosts that have the other endianness. However, this does not apply to
optimized data created by the just-in-time compiler.	optimized data created by the just-in-time compiler.
.sp	.sp
(k) The alternative matching function (\fBpcre_dfa_exec()\fP) matches in a	(k) The alternative matching functions (\fBpcre_dfa_exec()\fP and
different way and is not Perl-compatible.	\fBpcre16_dfa_exec()\fP) match in a different way and are not Perl-compatible.
.sp	.sp
(l) PCRE recognizes some special sequences such as (*CR) at the start of	(l) PCRE recognizes some special sequences such as (*CR) at the start of
a pattern that set overall options that cannot be changed within the pattern.	a pattern that set overall options that cannot be changed within the pattern.
Line 175 Cambridge CB2 3QH, England.	Line 183 Cambridge CB2 3QH, England.
.rs	.rs
.sp	.sp
.nf	.nf
Last updated: 14 November 2011	Last updated: 01 June 2012
Copyright (c) 1997-2011 University of Cambridge.	Copyright (c) 1997-2012 University of Cambridge.
.fi	.fi

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