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<?php $string = '405090000'; preg_match('/^(?<year>\d{1})(?<month>\d{2})(?<day>\d{2})/', $string, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(7) { [0]=> string(5) "40509" ["year"]=> string(1) "4" [1]=> string(1) "4" ["month"]=> string(2) "05" [2]=> string(2) "05" ["day"]=> string(2) "09" [3]=> string(2) "09" }

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