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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/pcre.xml, last change in rev 1.2 -->
<refentry id="function.preg-grep">
<refnamediv>
<refname>preg_grep</refname>
<refpurpose>
Return array entries that match the pattern
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>array</type><methodname>preg_grep</methodname>
<methodparam><type>string</type><parameter>pattern</parameter></methodparam>
<methodparam><type>array</type><parameter>input</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>flags</parameter></methodparam>
</methodsynopsis>
<para>
<function>preg_grep</function> returns the array consisting of
the elements of the <parameter>input</parameter> array that match
the given <parameter>pattern</parameter>.
</para>
<para>
<parameter>flags</parameter> can be the following flag:
<variablelist>
<varlistentry>
<term>PREG_GREP_INVERT</term>
<listitem>
<simpara>
If this flag is passed, <function>preg_grep</function> returns the
elements of the input array that do <emphasis>not</emphasis> match
the given <parameter>pattern</parameter>.
This flag is available since PHP 4.2.0.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
Since PHP 4.0.4, the results returned by <function>preg_grep</function>
are indexed using the keys from the input array. If this behavior is
undesirable, use <function>array_values</function> on the array returned by
<function>preg_grep</function> to reindex the values.
</para>
<para>
<example>
<title><function>preg_grep</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// return all array elements
// containing floating point numbers
$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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