302 redirect

I hope someone could help me.

How will I redirect

http://www.example.com to http://forums.example.com
and
http://example.com to http://forums.example.com

 

with something like this:

Options +FollowSymLinks 

RewriteEngine On 
RewriteCond %{HTTP_HOST} ^example\.com$ [NC] 
RewriteRule .* http://www.example.com%{REQUEST_URI} [R=301,L]
RewriteCond %{HTTP_HOST} !^(www\.)?example\.com$ [NC] 
RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.example\.com$ [NC] 
RewriteCond %{ENV:REDIRECT_STATUS} ^$ 
RewriteRule ^(.*)$ /%2/$1 [QSA,L]

Code (markup):

it will redirect www.example.com/test/ and example.com/test/ to test.example.com

Not tested