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<?php echo preg_replace_callback('/([a-z])([A-Z])/', function (array $matches) { var_dump($matches); }, 'eO');
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(2) "eO" [1]=> string(1) "e" [2]=> string(1) "O" }

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