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run code in 150+ php & hhvm versions
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<?php preg_match('/^([a-z0-9_]+)((?:::)([a-z0-9_]+))+/g', 'lol::second::third::fourth', $matches); var_dump($matches);
based on dnAgW
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier 'g' in /in/rXE9f on line 4 NULL
Output for hhvm-3.12.0
Warning: Unknown modifier 'g': [/^([a-z0-9_]+)((?:::)([a-z0-9_]+))+/g] in /in/rXE9f on line 4 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier 'g' in /in/rXE9f on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/rXE9f on line 4 array(0) { }