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<?php preg_match("/^(\w+)+(-\w+)?$/", "about-us-office-",$matches); print_r($matches); echo "\n"; preg_match("%^(\w+)\-\w+?$%", "about-us",$matches); print_r($matches);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( ) Array ( [0] => about-us [1] => about )

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