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<?php preg_match_all('/^([a-z0-9_]+)::([a-z0-9_]+)/', 'lol::second::third::fourth', $matches, PREG_PATTERN_ORDER); var_dump($matches);
based on M0fr6
Output for 4.3.0 - 7.1.0
array(3) { [0]=> array(1) { [0]=> string(11) "lol::second" } [1]=> array(1) { [0]=> string(3) "lol" } [2]=> array(1) { [0]=> string(6) "second" } }