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<?php $matches=array(); preg_match_all("/[a-z]*/i","php hhvm apache ",$matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> array(7) { [0]=> string(3) "php" [1]=> string(0) "" [2]=> string(4) "hhvm" [3]=> string(0) "" [4]=> string(6) "apache" [5]=> string(0) "" [6]=> string(0) "" } }

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