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<?php preg_match('/^blog\/(?P<year>[0-9]+){4}$/', 'blog/12345', $matches); var_dump($matches);
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
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" }

preferences:
284.53 ms | 401 KiB | 453 Q