mirror of
https://github.com/sigmasternchen/php-doc-en
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5b9fc29465
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@78496 c90b9560-bf6c-de11-be94-00142212c4b1
82 lines
2.6 KiB
XML
82 lines
2.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.2 $ -->
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<!-- splitted from ./en/functions/pcre.xml, last change in rev 1.2 -->
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<refentry id="function.preg-quote">
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<refnamediv>
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<refname>preg_quote</refname>
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<refpurpose>Quote regular expression characters</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>string</type><methodname>preg_quote</methodname>
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<methodparam><type>string</type><parameter>str</parameter></methodparam>
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<methodparam choice="opt"><type>string</type><parameter>delimiter</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>preg_quote</function> takes <parameter>str</parameter>
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and puts a backslash in front of every character that is part of
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the regular expression syntax. This is useful if you have a
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run-time string that you need to match in some text and the
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string may contain special regex characters.
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</para>
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<para>
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If the optional <parameter>delimiter</parameter> is specified, it
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will also be escaped. This is useful for escaping the delimiter
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that is required by the PCRE functions. The / is the most commonly
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used delimiter.</para>
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<para>
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The special regular expression characters are:
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<screen>. \\ + * ? [ ^ ] $ ( ) { } = ! < > | :</screen>
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</para>
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<para>
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<example>
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<title></title>
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<programlisting role="php">
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<![CDATA[
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$keywords = "$40 for a g3/400";
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$keywords = preg_quote ($keywords, "/");
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echo $keywords; // returns \$40 for a g3\/400
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]]>
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</programlisting>
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</example>
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<example>
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<title>Italicizing a word within some text</title>
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<programlisting role="php">
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<![CDATA[
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// In this example, preg_quote($word) is used to keep the
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// asterisks from having special meaning to the regular
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// expression.
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$textbody = "This book is *very* difficult to find.";
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$word = "*very*";
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$textbody = preg_replace ("/".preg_quote($word)."/",
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"<i>".$word."</i>",
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$textbody);
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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</refentry>
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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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