htaccess non existing subdomain to main domain redirection

Question

Need to know if this possible or not? If yes then how?

Main Domain is: abc.com ; Subdomain is: sub.abc.com

I want to redirect everything like [alphanumeric].abc.com to abc.com except the sub domain ( sub.abc.com ).

eg ajf43vsfvsuvfsg.abc.com to abc.com ; "ajfvsfvsuvfsg" doesn't exist.

Answer 1

Try putting these rules in the htaccess file in your document root:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^(sub\.)?abc.com$ [NC]
RewriteRule ^(.*)$ http://abc.com/$1 [L,R]

If someone types http://blah.abc.com/some/path in their browser's URL address bar, they'll get redirected to http://abc.com/some/path and the address in the address bar changes.