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