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<?php $string="1001-sdfjh"; $matches=array(); preg_match("/^(\d{4})-([A-Za-z0-9])/", $string, $matches); print_r($matches); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1001-s [1] => 1001 [2] => s )

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