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<?php preg_match_all('/(^[a-z0-9_]+(?=::))((?<=::)([a-z0-9_]+))/', 'lol::second::third::fourth', $matches); var_dump($matches);
based on iGEJI
Output for 4.3.0 - 7.2.0
array(4) { [0]=> array(0) { } [1]=> array(0) { } [2]=> array(0) { } [3]=> array(0) { } }