I know that is not good at all. There are patterns that I might be able to do lets say 25,000 lines at a time but it involves seeing the pattern, matching and then converting to lower case. is that possible. I'll show you 2 lines maybe you can see the pattern and help... I hope.
RewriteRule ^Emergency-Fast-Business-Rental/Hot/Connecticut/Fairfield/Aqua_Vista_Fast_Temp_Quick_Gas_Heaters_Rentals.html http://www.example.com/aqua_vista-ct-temporary_blah_blah_hot_heaters.html
Now this pattern changes the beginning before connecticuit and then after 'Aqua_Vista' and even the state and county change for every listing. I don't want a bad site performance.