Redirect domains to www

How can I redirect a domain from domain.com to www.domain.com?

 

RewriteCond %{HTTP_HOST} ^www\.(.+)\.(com|net|org|edu|info) [NC]
RewriteRule ^(.*) http://$1.$2 [L,R=301]


Something like this that actually works is what I need.

 

Something like that ?

RewriteEngine On

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

Code (markup):

 

Is there a way so I don't have to put it in each vhost

 

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

Code (markup):

Should redirect every domain (and subdomains) to the WWW version.