3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $kw = " asdsdfsdf \xFA as "; var_export(preg_match('/./u', $kw));
based on Youkg
Output for 5.3.4 - 7.2.6
false
Output for 4.3.5 - 5.3.3
0
Output for 4.3.0 - 4.3.4
1