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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<!-- Purpose: basic.text -->
<!-- Membership: bundled -->
<book xml:id="book.pcre" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Regular Expressions (Perl-Compatible)</title>
<titleabbrev>PCRE</titleabbrev>
<preface xml:id="intro.pcre">
&reftitle.intro;
<para>
The syntax for patterns used in these functions closely resembles
Perl. The expression must be enclosed in the delimiters, a
forward slash (/), for example. Delimiters can be any
non-alphanumeric, non-whitespace ASCII character except the backslash (\) and the
null byte. If the delimiter character has to be used in the
expression itself, it needs to be escaped by backslash. Since PHP
4.0.4, you can also use Perl-style (), {}, [], and <>
matching delimiters.
See <link linkend="reference.pcre.pattern.syntax">Pattern Syntax</link>
for detailed explanation.
</para>
<para>
The ending delimiter may be followed by various modifiers that
affect the matching.
See <link linkend="reference.pcre.pattern.modifiers">Pattern
Modifiers</link>.
</para>
<para>
PHP also supports regular expressions using a POSIX-extended syntax
using the <link linkend="book.regex">POSIX-extended regex functions</link>.
</para>
<note>
<para>
This extension maintains a global per-thread cache of compiled regular
expressions (up to 4096).
</para>
</note>
<warning>
<para>
You should be aware of some limitations of PCRE. Read <link
xlink:href="&url.pcre.man;">&url.pcre.man;</link> for more info.
</para>
</warning>
<para>
The PCRE library is a set of functions that implement regular
expression pattern matching using the same syntax and semantics
as Perl 5, with just a few differences (see below). The current
implementation corresponds to Perl 5.005.
</para>
</preface>
&reference.pcre.setup;
&reference.pcre.constants;
&reference.pcre.examples;
&reference.pcre.pattern;
&reference.pcre.reference;
</book>
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-->
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