redirect and rewrite problem

Hello, I have problem with with redirect and rewrite.

I wanted to redirect/rewrite http://users.domain.tld/user/foobar/ & http://users.domain.tld/~user/foobar

to

http://www.newdomain.tld ( not http://www.newdomain.tld/user/foobar/ or http://www.domain.tld/~user/foobar/ )

Thank you helping me.

peja