How to Exclude redirecting subdomains in htaccess RewriteRule

To exclude redirecting subdomains in htaccess RewriteRule use the following RewriteCond. This tell Apache to only use the redirect if the request is to the top level domain, not a subdomain.

RewriteCond %{HTTP_HOST} ^[^.]+\.[^.]+$

For instance, my .htaccess for jstassen.com looks like:

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteCond %{HTTP_HOST} ^[^.]+\.[^.]+$
RewriteRule ^(.*)$ https://jstassen.com/$1 [R=301,L]

This regex only fully matches the base domain. You can see this on Debuggex.

Note: websites with www are considered a subdomain. For instance www.jstassen.com is a subdomain of jstassen.com just like blog.jstasseen.com. This rule will therefore exclude the www subdomain. I have my www subdomain auto redirect to remove the www which I recommend.

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The rules

• Two matches @ mentions with no space between @thebox193@discodude
• Matches with one . in them @disco.dude but not two .. @disco..dude
• Beginning period not matched @.discodude
• Ending period not matched @discodude.
• Match underscores _ @_disco__dude_
• Max characters of 30 @1234567890123456789012345678901234567890

The RegEx

(?:@)([A-Za-z0-9_](?:(?:[A-Za-z0-9_]|(?:\.(?!\.))){0,28}(?:[A-Za-z0-9_]))?)

Hashtags

For hashtags use the same regex, it’s the same rules, just replace the @ for a #.

(?:#)([A-Za-z0-9_](?:(?:[A-Za-z0-9_]|(?:\.(?!\.))){0,28}(?:[A-Za-z0-9_]))?)

Examples

You can try it out over on Debuggex. Here is a an example implemented in JavaScript.

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