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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@78202 c90b9560-bf6c-de11-be94-00142212c4b1
124 lines
3.4 KiB
XML
124 lines
3.4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.1 $ -->
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<reference id="ref.regex">
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<title>Regular Expression Functions (POSIX Extended)</title>
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<titleabbrev>Regexps</titleabbrev>
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<partintro>
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<note>
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<para>
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PHP also supports regular expressions using a Perl-compatible syntax
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using the <link linkend="ref.pcre">PCRE functions</link>. Those functions
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support non-greedy matching, assertions, conditional subpatterns, and a
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number of other features not supported by the POSIX-extended regular
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expression syntax.
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</para>
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</note>
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<warning>
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<para>
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These regular expression functions are not binary-safe. The <link
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linkend="ref.pcre">PCRE functions</link> are.
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</para>
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</warning>
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<para>
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Regular expressions are used for complex string manipulation in
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PHP. The functions that support regular expressions are:
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<itemizedlist>
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<listitem>
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<simpara><function>ereg</function></simpara>
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</listitem>
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<listitem>
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<simpara><function>ereg_replace</function></simpara>
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</listitem>
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<listitem>
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<simpara><function>eregi</function></simpara>
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</listitem>
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<listitem>
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<simpara><function>eregi_replace</function></simpara>
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</listitem>
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<listitem>
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<simpara><function>split</function></simpara>
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</listitem>
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<listitem>
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<simpara><function>spliti</function></simpara>
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</listitem>
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</itemizedlist>
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These functions all take a regular expression string as their
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first argument. PHP uses the POSIX extended regular expressions
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as defined by POSIX 1003.2. For a full description of POSIX
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regular expressions see the regex man pages included in the regex
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directory in the PHP distribution. It's in manpage format, so
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you'll want to do something along the lines of <command>man
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/usr/local/src/regex/regex.7</command> in order to read it.
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</para>
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<para>
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<example>
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<title>Regular Expression Examples</title>
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<programlisting role="php">
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<![CDATA[
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ereg ("abc", $string);
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/* Returns true if"abc"
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is found anywhere in $string. */
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ereg ("^abc", $string);
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/* Returns true if "abc";
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is found at the beginning of $string. */
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ereg ("abc$", $string);
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/* Returns true if "abc"
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is found at the end of $string. */
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eregi ("(ozilla.[23]|MSIE.3)", $HTTP_USER_AGENT);
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/* Returns true if client browser
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is Netscape 2, 3 or MSIE 3. */
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ereg ("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string,$regs);
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/* Places three space separated words
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into $regs[1], $regs[2] and $regs[3]. */
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$string = ereg_replace ("^", "<br />", $string);
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/* Put a <br /> tag at the beginning of $string. */
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$string = ereg_replace ("$", "<br />", $string);
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/* Put a <br />; tag at the end of $string. */
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$string = ereg_replace ("\n", "", $string);
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/* Get rid of any newline
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characters in $string. */
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]]>
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</programlisting>
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</example>
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</para>
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</partintro>
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&reference.regex.functions;
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</reference>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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