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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/regex.xml, last change in rev 1.2 -->
<refentry id="function.ereg-replace">
<refnamediv>
<refname>ereg_replace</refname>
<refpurpose>Replace regular expression</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<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>
<simpara>
The modified string is returned. (Which may mean that the
original string is returned if there are no matches to be
replaced.)
</simpara>
<simpara>
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.
</simpara>
<simpara>
If no matches are found in <parameter>string</parameter>, then
<parameter>string</parameter> will be returned unchanged.
</simpara>
<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>
<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>
<para>
See also <function>ereg</function>, <function>eregi</function>,
<function>eregi_replace</function>, <function>str_replace</function>, and
<function>preg_match</function>.
</para>
</refsect1>
</refentry>
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