3v4l.org

run code in 300+ PHP versions simultaneously
<?php $sDomain_name = 'your-domain.com'; $db_domain_name = 'your-domain.com'; var_dump(preg_match('/(^|\.)'.preg_quote($sDomain_name).'($|:[0-9]+)/i', $db_domain_name));

preferences:
32.04 ms | 402 KiB | 5 Q