<?php
$pattern = '/(userAgent\.value\.token);/i';
$ua = "Mozilla/5.0 (infoscom.iPad.1; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10";
var_dump(preg_match($pattern, $ua, $reMatches), $reMatches);