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<?php $str = '123-12-123'; preg_match('/\d{3}\-\d(\d\-\d{3}|)/', $str, $matches); var_dump($matches); $str = '1-1-1'; preg_match('/\d{3}\-\d{2}\-\d{3}/', $str, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(10) "123-12-123" [1]=> string(5) "2-123" } array(0) { }

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