php-doc-en/reference/regex/examples.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<appendix xml:id="regex.examples">
 &reftitle.examples;
 <para>
  <example>
  <title>Regular Expression Examples</title>
   <programlisting role="php">
<![CDATA[
<?php
// Returns true if "abc" is found anywhere in $string.
ereg("abc", $string);            

// Returns true if "abc" is found at the beginning of $string.
ereg("^abc", $string);

// Returns true if "abc" is found at the end of $string.
ereg("abc$", $string);

// Returns true if client browser is Netscape 2, 3 or MSIE 3.
eregi("(ozilla.[23]|MSIE.3)", $_SERVER["HTTP_USER_AGENT"]);

// Places three space separated words into $regs[1], $regs[2] and $regs[3].
ereg("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string, $regs); 

// Put a <br /> tag at the beginning of $string.
$string = ereg_replace("^", "<br />", $string); 

// Put a <br /> tag at the end of $string.
$string = ereg_replace("$", "<br />", $string); 

// Get rid of any newline characters in $string.
$string = ereg_replace("\n", "", $string);
?>
]]>
   </programlisting>
  </example>
 </para>
</appendix>

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