change category on multiple posts

What expression can i use for redirect all the posts with a taxonomy to others?

Ex
http://www.mysite.com/category1/post1 to http://www.mysite.com/category2/post1
http://www.mysite.com/category1/post2 to http://www.mysite.com/category2/post2
http://www.mysite.com/category1/post3 to http://www.mysite.com/category2/post3

I already have the two posts with same name in each cathegory.

Individual redirection for each post works ,but I need an expression to redirect entire category.
Thanks

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