Online PHP editor | output for 4n04H

<?php $str = 'Thank you for enrolling for Invoice Gateway with Harry Cooper Supply Company To activate your Invoice Gateway account, please click the below link. If you cannot click this link, you should copy and paste this entire link into your browser or AOL address box and press enter. https://secure.billtrust.local/harrycooper/ig/signup/activate?t=12345BYCKCBJTVHPKU'; $regex = "/https:([a-zA-Z0-9_]*)/"; $output = preg_match_all($regex, $str, $matches); print_r($matches);