3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $s = "efpinezf'àçhfnds__+-"; $sep = '-'; $regexp = '/[^a-z0-9-_]+/i'; $res = preg_replace($regexp, $sep, $s);var_dump(trim($res));
Output for 4.3.0 - 7.2.0
string(18) "efpinezf-hfnds__--"