Thanks! I've realized I need to come up with a better way to handle the special RewriteCond patterns, such as -f and -d. Right now all variables are handled in

Thanks! I've realized I need to come up with a better way to handle the special RewriteCond patterns, such as -f and -d. Right now all variables are handled in the same naive way, i.e. you get to specify their value in text form, but for things like -f/d/l that doesn't work (because for instance -f tests if the input string is a file in the current directory)