How to redirect www to root domain (non-www)?

[Stephanie]

I want to redirect www to my root domain, so I have written the following lines in the .htaccess file.

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

But code doesn't work.

Is there another way I can redirect www to the root domain?

[Moriana]

Which web server are you using?
If you are using IIS on Windows, then you have to use IIS URL Rewrite.

[Stephanie]

I am using shared hosting.
Should I contact the web host?

[KelvinSmith]

By using the following code you can be done redirecting www to root domain(non-www).

$HTTP["host"] =~ "^www\.(.*)$" {
url.redirect = ( "^/(.*)" => "http://%1/$1" )
}

Make sure the mod_redirect module is installed on your server to work this rule. You need to add the code at the top of the config file before other redirect/rewrite rules.