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<?php preg_match_all('/^[a-z0-9_]+(::[a-z0-9_]+)/', 'lol::second::third::fourth', $matches, PREG_PATTERN_ORDER); var_dump($matches);
based on 6eOIX
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(1) { [0]=> string(11) "lol::second" } [1]=> array(1) { [0]=> string(8) "::second" } }