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<?php var_dump(preg_match("/([a-zA-Z0-9\.\-_~!$&'()*+,;=:@]+)/", 'abc?', $m)); var_dump($m);
Output for 4.3.0 - 7.1.0
int(1) array(2) { [0]=> string(3) "abc" [1]=> string(3) "abc" }