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<?php preg_match('/^blog\/(?P<year>[0-9]+){4}$/', 'blog/12345', $matches); var_dump($matches);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(10) "blog/12345" ["year"]=> string(1) "5" [1]=> string(1) "5" }
Output for 4.3.0 - 4.3.2
array(2) { [0]=> string(10) "blog/12345" [1]=> string(1) "5" }