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<?php #http://tools.ietf.org/html/rfc4648#section-5 var_dump(preg_match("/^([a-zA-Z0-9\-._~!$&'()*+,;=:@]+)$/", 'abcddd-66?7', $m)); var_dump($m);

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34.33 ms | 402 KiB | 5 Q