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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.ereg-replace">
<refnamediv>
<refname>ereg_replace</refname>
<refpurpose>Replace regular expression</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>ereg_replace</methodname>
<methodparam><type>string</type><parameter>pattern</parameter></methodparam>
<methodparam><type>string</type><parameter>replacement</parameter></methodparam>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
</methodsynopsis>
<simpara>
This function scans <parameter>string</parameter> for matches to
<parameter>pattern</parameter>, then replaces the matched text
with <parameter>replacement</parameter>.
</simpara>
&warn.deprecated.function-5-3-0.removed-6-0-0;
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>pattern</parameter></term>
<listitem>
<para>
A POSIX extended regular expression.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>replacement</parameter></term>
<listitem>
<para>
If <parameter>pattern</parameter> contains parenthesized substrings,
<parameter>replacement</parameter> may contain substrings of the form
<literal>\\<replaceable>digit</replaceable></literal>, which will be
replaced by the text matching the digit'th parenthesized substring;
<literal>\\0</literal> will produce the entire contents of string.
Up to nine substrings may be used. Parentheses may be nested, in which
case they are counted by the opening parenthesis.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>string</parameter></term>
<listitem>
<para>
The input string.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The modified string is returned. If no matches are found in
<parameter>string</parameter>, then it will be returned unchanged.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
For example, the following code snippet prints "This was a test"
three times:
</para>
<para>
<example>
<title><function>ereg_replace</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$string = "This is a test";
echo str_replace(" is", " was", $string);
echo ereg_replace("( )is", "\\1was", $string);
echo ereg_replace("(( )is)", "\\2was", $string);
?>
]]>
</programlisting>
</example>
</para>
<para>
One thing to take note of is that if you use an integer value as
the <parameter>replacement</parameter> parameter, you may not get
the results you expect. This is because
<function>ereg_replace</function> will interpret the number as
the ordinal value of a character, and apply that. For instance:
</para>
<para>
<example>
<title><function>ereg_replace</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
/* This will not work as expected. */
$num = 4;
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string; /* Output: 'This string has words.' */
/* This will work. */
$num = '4';
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string; /* Output: 'This string has 4 words.' */
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>Replace URLs with links</title>
<programlisting role="php">
<![CDATA[
<?php
$text = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]",
"<a href=\"\\0\">\\0</a>", $text);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.regex.deprecated;
<tip>
<para>
<function>preg_replace</function>, which uses a Perl-compatible
regular expression syntax, is often a faster alternative to
<function>ereg_replace</function>.
</para>
</tip>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ereg</function></member>
<member><function>eregi</function></member>
<member><function>eregi_replace</function></member>
<member><function>str_replace</function></member>
<member><function>preg_match</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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