Do you mean, would I regret doing things, or would I regret NOT doing things? I personally feel that I would not have any regrets, because I believe in reincarnation, so whatever I do not get a chance to do in this life, I will have another chance in a future existence. That's unless I manage to become so enlightened that I hop off the wheel of karma and life altogether, which is certainly not going to happen to me for another millennium or so!