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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match("/^([a-zA-Z0-9.\-_~!$&'()*+,;=:@]+)$/", 'abc/ddd', $m)); var_dump($m);
Output for 4.3.0 - 7.3.0rc4
int(0) array(0) { }