Mod_rewrite - 如何301将旧URL重定向到新URL

I need to grab some of my website's old URLs and do a 301 redirect to the new ones, since they are already indexed and we don't want to loose relevance after the change. The old URL is in fact very ugly and for some reason everything I try to do to rewrite it does not work. Here it is:I need to grab some of my website's old URLs an