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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 preg_replace('/([a-z]+)(_[a-z]+)/', '$1.$2', 'rob_tr_yuui');
Output for git.master, git.master_jit, rfc.property-hooks
rob._tr_yuui

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