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<?php echo preg_replace_callback('/_([a-z])/', function($a) { var_dump($a); return strtoupper($a[0]);}, 'rob_tr_yuui');
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(2) "_t" [1]=> string(1) "t" } array(2) { [0]=> string(2) "_y" [1]=> string(1) "y" } rob_Tr_Yuui

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