ErrorDocument 404 /
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^([a-z0-9\-]+)\.domain\.com$ [NC]
RewriteCond %1 !^www$ [NC]
RewriteRule (.*) http://domain.com/%1 [R=301,L,NC]
ErrorDocument 404 /
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^([a-z0-9\-]+)\.domain\.com$ [NC]
RewriteCond %1 !^www$ [NC]
RewriteRule (.*) http://test.domain.com/%1 [R=301,L,NC]