Suggestion: Make it easier to set up a filter or redirect

[TsukiZero]

Here's a few ways I think it could make things easier:

1. A Filter/Redirect Wizard. It would look at the current URL and ask you what you want it to wind up like, then generate a pattern from there.
2. A pattern preview. After making a pattern, it could show an example of what is being captured and what will be changed. If there's any issue with it, then it could show an error and say what is wrong/missing.
3. A pattern analyzer. After insert any URL, it gives out all elements in it, tags for them, and help finding what you want to keep in or leave out.