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$str = "required|equals[1|2|3|4|5]|trim"; preg_match_all('/[^\[\|]+(?:\[.+?\])?/', $str, $matches); print_r($matches[0]);<?php
Output for 4.3.0 - 5.4.32
$str = "required|equals[1|2|3|4|5]|trim"; preg_match_all('/[^\[\|]+(?:\[.+?\])?/', $str, $matches); print_r($matches[0]);<?php