modrewrite for http://nick.domain.com <- to catch this condiction

[StErMi]

I'm sorry for my bad english =)

I want to use modrewrite to do this:

http://nickname.domain.com OR http://www.nickname.domain.com

----->

http://www.domain.com/profile.php?nick=nickname

i wish that you understand my question =)

thank you very much :)