Htaccess URL Rewrite and Error Page

I need some minor changes to the htaccess rewrite. If you are not very good with rewrites do not bid on this project. Pleas read carefully and be sure you understand the project before bidding. 1. The rewrite works fine until the url is entered with a trailing slash. I need it to work with or with out the slash and going to the same url. Here is an example: A form sends the input to the the result page. The url looks like this: [login to view URL] The url is rewritten to [login to view URL] If a url is entered with a trailing slash at the end like this [login to view URL] An error occurs and the function does not work. The rewrite should work with all forms of domains, like .com, .net, .info, .org, .us, au, etc. 2. Also if a sub domain is entered I want an error page to return as a result. I will make the page. anything that is not a regular url should return the error page. Here are some examples: [login to view URL] [login to view URL] Attached is the rewrite page.