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<book xml:id="book.regex" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>Regular Expression (POSIX Extended)</title>
 <titleabbrev>POSIX Regex</titleabbrev>

 <preface xml:id="intro.regex">
  &reftitle.intro;
  <tip>
   <para>
    PHP also supports regular expressions using a Perl-compatible syntax
    using the <link linkend="book.pcre">PCRE functions</link>. Those functions
    support non-greedy matching, assertions, conditional subpatterns, and a
    number of other features not supported by the POSIX-extended regular
    expression syntax.
   </para>
  </tip>
  <warning>
   <para>
    These regular expression functions are not binary-safe. The <link
    linkend="book.pcre">PCRE functions</link> are.
   </para>
  </warning>
  <note>
   <para>
    As of PHP 5.3.0 this extension is deprecated, calling any function 
    provided by this extension will issue an <constant>E_DEPRECATED</constant> 
    notice.
   </para>
  </note>
  <para>
   Regular expressions are used for complex string manipulation.
   PHP uses the POSIX extended regular expressions as defined by POSIX
   1003.2. For a full description of POSIX regular expressions see the <link xlink:href="&url.regex.man;">regex
   man pages</link> included in the regex directory in the PHP distribution. It's
   in manpage format, so you'll want to do something along the lines of
   <command>man /usr/local/src/regex/regex.7</command> in order to read it.
  </para>
 </preface>

 &reference.regex.setup;
 &reference.regex.constants;
 &reference.regex.examples;
 &reference.regex.reference;

</book>
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