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run code in 200+ php & hhvm versions
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<?php var_dump(preg_replace("/^[^a-zA-Z]+|[^a-z0-9_.\-@]+/", "",'_(32jkashdfkj$#!!&&')); var_dump( preg_replace( '|[^a-z0-9_.\-@]|i', '', '_(32jkashdfkj$#!!&&' ));
Output for 4.3.0 - 7.1.7, 7.2.0
string(9) "jkashdfkj" string(12) "_32jkashdfkj"
Output for 7.1.10

Process exited with code 137.