Question

I have two websites that is actually the same where example.com shares all files from examples.com. So whatever changes made in exampples.com, example.com automatically gets updated. That means they have the same .htaccess file.
The problem is, I want to both sites redirects to non www to a www url. I got this:

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

Answer 1

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