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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@164281 c90b9560-bf6c-de11-be94-00142212c4b1
128 lines
3.6 KiB
XML
128 lines
3.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.11 $ -->
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<reference id="ref.regex">
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<title>Regular Expression Functions (POSIX Extended)</title>
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<titleabbrev>POSIX Regex</titleabbrev>
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<partintro>
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<section id="regex.intro">
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&reftitle.intro;
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<tip>
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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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</tip>
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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.
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PHP uses the POSIX extended regular expressions as defined by POSIX
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1003.2. For a full description of POSIX regular expressions see the <ulink url="&url.regex.man;">regex
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man pages</ulink> included in the regex directory in the PHP distribution. It's
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in manpage format, so you'll want to do something along the lines of
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<command>man /usr/local/src/regex/regex.7</command> in order to read it.
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</para>
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</section>
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<section id="regex.requirements">
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&reftitle.required;
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&no.requirement;
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</section>
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&reference.regex.configure;
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<section id="regex.configuration">
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&reftitle.runtime;
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&no.config;
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</section>
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<section id="regex.resources">
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&reftitle.resources;
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&no.resource;
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</section>
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<section id="regex.constants">
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&reftitle.constants;
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&no.constants;
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</section>
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<section id="regex.examples">
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&reftitle.examples;
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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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<?php
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// Returns true if "abc" is found anywhere in $string.
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ereg("abc", $string);
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// Returns true if "abc" is found at the beginning of $string.
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ereg("^abc", $string);
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// Returns true if "abc" is found at the end of $string.
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ereg("abc$", $string);
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// Returns true if client browser is Netscape 2, 3 or MSIE 3.
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eregi("(ozilla.[23]|MSIE.3)", $HTTP_USER_AGENT);
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// Places three space separated words into $regs[1], $regs[2] and $regs[3].
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ereg("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string, $regs);
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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("$", "<br />", $string);
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// Get rid of any newline characters in $string.
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$string = ereg_replace("\n", "", $string);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</section>
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<section id="regex.seealso">
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&reftitle.seealso;
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<para>
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For regular expressions in Perl-compatible syntax have a look at the
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<link linkend="ref.pcre">PCRE functions</link>. The simpler shell style
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wildcard pattern matching is provided by <function>fnmatch</function>.
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</para>
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</section>
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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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