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run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match_all('@[\x80-\xff]@','mm我艹',$m); print_r($m);
based on fZiuH
Output for 4.3.0 - 7.2.0
Array ( [0] => Array ( [0] => � [1] => � [2] => � [3] => � [4] => � [5] => � ) )