3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $match=preg_replace('~(..)*~','', str_repeat('.', 9431) ); var_dump($match);
based on Ym9cJ
Output for 7.0.0 - 7.2.0
NULL
Output for 5.5.0 - 5.6.28
string(1) "."