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<?php preg_match('|^\w+-(\w+)-(\w*)-(\w+)$|', '1234-123--132', $m); var_dump($m);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(13) "1234-123--132" [1]=> string(3) "123" [2]=> string(0) "" [3]=> string(3) "132" }