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

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