We have a website where the URL looks something like, www.example.com/about.smart.html ( "smart" being selector added on the app server based on the useragent if its a smart phone device) We need to redirect the page to 404 if the URL is changed by the user as like below: www.example.com/about.abc.xyz.smart.html www.example.com/about.smart.abc.html I tried with the below rule, but this redirects to 404 only for 1) and not for 2) RewriteCond %{REQUEST_URI} !^(.*)(-)\.html$ RewriteRule (.*)\.(.*).smart.html$ - [R=404,L] Any pointers on this would be of great help.