3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php if (preg_match('~^(?(?=\d+$)\d{1,5}|.*)$~', "123456")) { echo 'Match found.'; }
based on ZQVXb
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.1.0 - 7.3.0beta1