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run code in 150+ php & hhvm versions
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<?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 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(18) "efpinezf-hfnds__--"