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<?php echo preg_replace_callback('/([a-z])(_[a-z])/', function($u) { //var_dump($u); return $u[0].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
rob_tBr_yRuui rob._tr._yuui

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