$re = '/<img(.+)src=[\'"](.+?)[\'"](.*?)\>/';
$str = '<div align="center"><img src="media/k2/local/594b89d436f4b.jpeg" border="0" alt="" /><br /><br /><img src="media/k2/local/594b89d59fe0b.jpeg" border="0" alt="" /><br /><br /><img src="media/k2/local/594b89d68659f.jpeg" border="0" alt="" /><br /><br /><img src="media/k2/local/594b89d7289b6.jpeg" border="0" alt="" /><br /><br /><img src="media/k2/local/594b89d7cc2db.jpeg" border="0" alt="" /><br /><br /><img src="media/k2/local/594b89d8e3c3d.jpeg" border="0" alt="" /><br /><br /><img src="media/k2/local/594b89d9c732d.jpeg" border="0" alt="" /></div>
<img src="media/k2/local/594b89d436f4b.jpeg" border="0" alt="" />
<img src="media/k2/local/2.jpeg" border="0" alt="" />';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php