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<?php preg_match_all('/([a-z0-9_]+)::([a-z0-9_]+)/', 'lol::second::third::fourth', $matches, PREG_SET_ORDER); var_dump($matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> array(3) { [0]=> string(11) "lol::second" [1]=> string(3) "lol" [2]=> string(6) "second" } [1]=> array(3) { [0]=> string(13) "third::fourth" [1]=> string(5) "third" [2]=> string(6) "fourth" } }

preferences:
277.52 ms | 406 KiB | 459 Q