To test your htaccess rewrite rules, simply fill in the url that you're applying the rules to, place the contents of your htaccess on the larger input area and press "Test" button.

This was made in a very short amount of time, so there might be a few bugs we overlooked. If you happen to find an issue or would like to suggest something that we can improve upon please get in touch with us.
There are a couple of things which are not supported yet (like %{REQUEST_FILENAME}) but we hope to add them in the future.
We need to find a good way to implement those, please comment if you have suggestions.