<?php var_dump(preg_replace("/^[^a-zA-Z]+|[!#$%&'* +/\=?^`{|}~]+/", "", '_(32jkashdfkj$#!!&&')); var_dump( preg_replace( '|[^a-z0-9_.\-@]|i', '', '_(32jkashdfkj$#!!&&' ));
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