[BjörnJ]

www.example.com ska till example.com och www.example.se ska till example.se?

Options +FollowSymLinks
RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} ^www.example.com [NC]
RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^www.example.se [NC]
RewriteRule ^(.*)$ http://example.se/$1 [R=301,L]

Edit: Ett mellanslag saknades.