mod_rewrite tricks

Mod_rewrite is an incredibly powerful tool and a lot of us would be very lost without it!
 A couple of quick “tricks” using mod_rewrite – partially to help myself find them again in the future:

 Redirecting domain.tld to www.domain.tld

RewriteEngine On

RewriteBase /
RewriteCond %{HTTP_HOST} !^www.domain.tld$ [NC]

RewriteRule ^(.*)$ http://www.domain.tld/$1 [L,R=301]

 This can be put in a .htaccess in the website’s root.

It will match any HTTP request that is NOT for www.domain.tld and rewrite it to www.domain.tld

Changing File Extensions

If you have changed file extensions on a site, for example moving all files from being “.htm” to “.php” then this line of code will save you a lot of hassle.
Not only will it help with any inbound links, but also for any internal links that you need to edit, but haven’t:

 RewriteRule ^(.*).htm$ $1.php [R=301]

the first file extension in the line is the one you are replacing, while the second is the replacement.