PHP: ereg function Deprecated

php_ereg_function_in_53.php

<?php 
// 
// Source: http://www.devthought.com/2009/06/09/fix-ereg-is-deprecated-errors-in-php-53/
// 

// To migrate ereg():
ereg('\.([^\.]*$)', $this->file_src_name, $extension);

// becomes
preg_match('/\.([^\.]*$)/', $this->file_src_name, $extension);

// Notice that I wrapped the pattern (\.([^\.]*$)) around / /, which are RegExp delimiters. 
// If you find yourself escaping / too much (for an URL for example), you might want to use the # delimiter instead.

//Basically, to make the pattern match characters in a case-insensitive way, append i after the delimiter:
eregi('\.([^\.]*$)', $this->file_src_name, $extension);

// becomes
preg_match('/\.([^\.]*$)/i', $this->file_src_name, $extension);