Apache server configuration directives: .htaccess for redirect for mobile browsers else redirect requests to www version of site

This should be an easy script to write for .htaccess file for the write person that is a pro at regular expressions. The .htaccess file should do the following: look for mobile browsers and redirect to [login to view URL] ELSE redirect to [login to view URL] (including all [login to view URL] goes to [login to view URL]) EXCEPT FOR when a mobile browser choose to view the regular [login to view URL] via a cookie setting. I believe this can be checked in the .htaccess file. This is what I need. Should be pretty simple for the right person. KEEP IN MIND: this is for a Ruby on Rails application running the [login to view URL] apache module. Although your code for .htaccess should not be dependent on the application code (I will set the cookie via the application ) just wanted to let you know environment the code will interact with. Should be a non issue.