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<?php echo preg_replace_callback('/([a-z])(_[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(3) { [0]=> string(4) "b_tr" [1]=> string(1) "b" [2]=> string(3) "_tr" } roBtr_yuui

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