no-www url for sub-directory/sub-domain

Question

Say example my domain is http://www.domain.com and i wanted to redirect into no-www url ( http://domain.com ), for that i used this code in .htaccess

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

It's working fine http://www.domain.com redirects to http://domain.com .

Now i have a sub-domain http://www.blog.domain.com (public_html/blog) to be redirected into no-www url http://blog.domain.com for that i used this code.

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

But then also www is not removing in the sub-domain url. What i am doing wrong here?

Update: My hosting provider is hostgator

Answer 1

Step 1:

It seems there is a WP .htaccess inside /public_html/blog also. Add this rule before WP rules in your /public_html/blog/.htaccess:

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

Step 2:

Then in WP permalink settings change your blog address to:

http://blog.domain.com