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<?php $matches = array(); var_dump(preg_match_all('/[^a-zA-Z0-9.\-\s]+/', '[[-?)', $matches)); var_dump($matches);
Output for 4.3.0 - 7.1.0
int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } }