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<?php preg_match('/^blog\/(?P<year>[0-9]{4})$/', 'blog/1234', $matches); var_dump($matches);
Output for 4.3.3 - 7.1.0
array(3) { [0]=> string(9) "blog/1234" ["year"]=> string(4) "1234" [1]=> string(4) "1234" }
Output for 4.3.0 - 4.3.2
array(2) { [0]=> string(9) "blog/1234" [1]=> string(4) "1234" }