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<?php $str = "required|equals[1|2|3|4|5]|trim"; preg_match_all('/[^\[\|]+(?:\[.+?\])?/', $str, $matches); print_r($matches[0]); ?>
Output for 4.3.0 - 7.2.0
Array ( [0] => required [1] => equals[1|2|3|4|5] [2] => trim )