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<?php preg_match('/http(s)?:\/\/(www\.)?vimeo.com\/(\d+)($|\/)/', 'http://vimeo.com/31398940', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> string(25) "http://vimeo.com/31398940" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(8) "31398940" [4]=> string(0) "" }