If you want to redirect non www users to www version of your website, you can use the following code:

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

but in case of sub domains, this’ll create problems. The code above redirects anything *except* www.example.com to www.example.com.

You’d undoubtedly be happier using a positive-match pattern, instead of the negative match used in the above example.

RewriteEngine On
#
# Redirect www.<subdomain>.example.com/<anything> to <subdomain>.example.com/<anything>
RewriteCond %{HTTP_HOST} ^www\.([^.]+)\.example\.com
RewriteRule (.*) http://%1.example.com/$1 [R=301,L]
#
# Redirect example.com/<anything> to www.example.com/<anything>
RewriteCond %{HTTP_HOST} ^example\.com
RewriteRule (.*) http://www.example.com/$1 [R=301,L]

Cheers & Happy Coding….

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Tips & Tricks .htaccesss, 301 Redirect, Tips