More robust filters

Hey love the app, the filters are a very useful feature but I was curious with we could get a few more advanced options.

• Currently we cannot replace characters with a space, filters see it as an empty string but sometimes the space would be useful over skipping a character to force TTS to break hyphens into two seperate words.

• Regex filter options, allowing for advanced logic and an ability to anticipate some variations in filters

• Smart filters filters that apply only under certain context. Good examples: filters A, B and C only run on epub file types, while D E and F run only on web links.

• Web based filters or html filters. The ability to build a filter or custom parser using context like web url domains and html bodies or xpath locations and the ability to auto run them in import from a webpage would be great. That way I can pre scrub out all of the UI text elements that get passed into the reader from url sharing.

Thanks!