3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if (preg_match('/AB[č]D/u', 'ABčD')) echo 'OK'; else echo 'KO';
Output for 4.3.3 - 7.1.0
OK
Output for 4.3.0 - 4.3.2
KO