1. When Chat_Msg_System/ERR_QUEST_REWARD_EXP_I is fired, how can i catch what is in %s and so with others system messages with &s &d simultaniously?


    There is an addon library called Deformat that you can use for this sort of thing. You can manually make a pattern that can capture the information you want, but that won't be portable across different client locales. It depends on how general purpose you want the addon to be and whether or not you'd like to distribute it.