3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $match=preg_replace('~(..)+~','', str_repeat('.', 5431) ); var_dump($match);
based on u97IX
Output for 5.3.20 - 5.6.28, 7.0.6 - 7.2.0
string(1) "."
Output for 7.0.0 - 7.0.5
NULL