Welcome to WebmasterWorld Guest from 220.127.116.11
I could spend the next three hours trying to figure it out, but I was hoping one of you smart people could lend me a hand....
I would guess if you used this search in your favorite SE:
redirect to a new domain 301 site:webmasterworld.com/forum92/
Visited this thread [webmasterworld.com] and read post #4.
You could find the answer already posted here numerous times =)
Then we would probably be very happy to help you if you get stuck with something you are trying to make work.
BTW You can remove the third line of the code I suggested if the domains are all hosted separately, and the first line may or may not be necessary depending on server configuration -- you may need to test it both ways.
Its not that I'm to lazy to do a search of webmaster world for myself, its that there is so much different information available that I feel unqualified to separate out exactly what I need from the rest of what is out there. I've always been very poor at using regular expressions, so I appreciate the expretise of those who know better than me.