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<?php echo preg_replace_callback('/(_?[a-z]+)/', function($u) { var_dump($u); return ucwords(str_replace('_', '', $u[0])); } , 'rob_tr_yuui');
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(3) "rob" [1]=> string(3) "rob" } array(2) { [0]=> string(3) "_tr" [1]=> string(3) "_tr" } array(2) { [0]=> string(5) "_yuui" [1]=> string(5) "_yuui" } RobTrYuui

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