Redirect non www to www or vice versa (main domain, subdomain)

@danpros wrote:

There is a project that requires me to make the following domain redirection:

• Redirect all users to access the site WITHOUT the 'www.' prefix for all subdomain.
• Redirect all users to access the site WITH the 'www.' prefix for main domain only.

To fulfill this purpose, I simply add a few lines of code to the htaccess file.

RewriteEngine on

# Redirect the 'www.' version of the subdomains.
RewriteCond %{HTTP_HOST} ^www\.([^.]+)\.example\.com [NC]
RewriteRule ^(.*)$ http://%1.example.com/$1 [R=301,L]

# Redirect the non 'www.' version of the main domain.
RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]

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