3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match('/^\/validation\/(?P<user_name>\.*)?\/(?P<user_key>\w+)?\/$/', "/validation/a%a/1/",$matches); print_r($matches); echo "\n";
Output for 4.3.0 - 7.2.0
Array ( )