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run code in 150+ php & hhvm versions
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<?php preg_match_all('/^[a-z0-9_]+(?=::)(?<=::)([a-z0-9_]+)/', 'lol::second::third::fourth', $matches); var_dump($matches);
based on tli3i
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> array(0) { } [1]=> array(0) { } }