An idea to add counter to added domains/regex, like this
What is this counter counting, and from where did you get this screen grab?
This counter counts successive occurrences for the given domain / regex. If you see zeros it means that e.g. regex is invalid. My screen is only visualisation made in graphic editor
Not necessarily. It only means you haven't visited a domain covered by that regex.
@yubiuser is absolutely right. You might draw the wrong conclusions. Once day later one of your devices could connect to such a domain.
I want to point out that this is already possible with Pi-hole when using the long-term database. All queries blocked due to regex are logged with their IDs in the