Redirect if domain is not correct

It's better to make 301 redirect in SEO purposes:

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

You can do this with an If directive...

<If "%{HTTP_HOST} != 'www.example.com'">
Redirect / http://www.example.com/
</If>

Or mod_rewrite. See http://httpd.apache.org/docs/current/rewrite/remapping.html

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

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