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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.preg-quote" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>preg_quote</refname>
<refpurpose>Quote regular expression characters</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>preg_quote</methodname>
<methodparam><type>string</type><parameter>str</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>delimiter</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
<function>preg_quote</function> takes <parameter>str</parameter>
and puts a backslash in front of every character that is part of
the regular expression syntax. This is useful if you have a
run-time string that you need to match in some text and the
string may contain special regex characters.
</para>
<para>
The special regular expression characters are:
<literal>. \ + * ? [ ^ ] $ ( ) { } = ! < > | : - #</literal>
</para>
<para>
Note that <literal>/</literal> is not a special regular expression character.
</para>
<note>
<para>
Note that <function>preg_quote</function> is not meant to be applied to the
$replacement string(s) of <function>preg_replace</function> etc.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>str</parameter></term>
<listitem>
<para>
The input string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>delimiter</parameter></term>
<listitem>
<para>
If the optional <parameter>delimiter</parameter> is specified, it
will also be escaped. This is useful for escaping the delimiter
that is required by the PCRE functions. The <literal>/</literal> is the most commonly
used delimiter.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the quoted (escaped) string.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.3.0</entry>
<entry>
The <literal>#</literal> character is now quoted
</entry>
</row>
<row>
<entry>7.2.0</entry>
<entry>
<parameter>delimiter</parameter> is nullable now.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>preg_quote</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$keywords = '$40 for a g3/400';
$keywords = preg_quote($keywords, '/');
echo $keywords; // returns \$40 for a g3\/400
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>Italicizing a word within some text</title>
<programlisting role="php">
<![CDATA[
<?php
// In this example, preg_quote($word) is used to keep the
// asterisks from having special meaning to the regular
// expression.
$textbody = "This book is *very* difficult to find.";
$word = "*very*";
$textbody = preg_replace ("/" . preg_quote($word, '/') . "/",
"<i>" . $word . "</i>",
$textbody);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.bin-safe;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><link linkend="pcre.pattern">PCRE Patterns</link></member>
<member><function>escapeshellcmd</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
|
