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<?php preg_match('/^([a-z0-9_]+)((?:::)([a-z0-9_]+))+/', 'lol::second::third::fourth', $matches); var_dump($matches);
based on sQY96
Output for 4.3.0 - 7.1.0
array(4) { [0]=> string(26) "lol::second::third::fourth" [1]=> string(3) "lol" [2]=> string(8) "::fourth" [3]=> string(6) "fourth" }