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run code in 150+ php & hhvm versions
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<?php #http://tools.ietf.org/html/rfc4648#section-5 var_dump(preg_match("/^([a-zA-Z0-9.\-_~!$&'()*+,;=:@]+)$/", 'abcddd', $m)); var_dump($m);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(2) { [0]=> string(6) "abcddd" [1]=> string(6) "abcddd" }