3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(!preg_match('/^[0-9]{4}$/', "xxxxx"));
based on LihQ4
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc2
bool(true)