Using htaccess to redirect all subdomains except one

Question

current htaccess:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^mywebsite.co.uk [NC]
RewriteRule ^(.*)$ http://www.mywebsite.co.uk/$1 [L,R=301,NC]

I also have a subdomain : m.mywebsite.co.uk I don't want this "m." domain redirected, but all other subdomains that exist or not directed to www.mywebsite.co.uk including "mywebsite.co.uk"

Can you help? thanks

Answer 1

Try :

RewriteEngine on
RewriteCond %{HTTP_HOST} !^m\.mywebsite\.co\.uk$
RewriteCond %{HTTP_HOST} !^www\.mywebsite\.co\.uk$ [NC]
RewriteRule ^(.*)$ http://www.mywebsite.co.uk/$1 [L,R=301,NC]