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If you are Experiencing issues with a Pi-hole install that has non-standard elements (e.g you are using nginx instead of lighttpd, or there is some other aspect of your install that is customised) - please use the Community Help category.
Expected Behaviour:
Trying to block youtube ads, since they have become more of a nuisance due to Covid.
Actual Behaviour:
I am trying to create a regex filter to blacklist youtube ads. A youtube ad server name looks like "r4---sn-a5meknsy.googlevideo.com". My regex is "^r([0-9]+)---sn-([a-z-0-9])+.googlevideo.com$". I validated my regex through https://regexr.com/. When I enter my regex in PiHole admin console to blacklist, I get a message that my regex blacklist is successfully created. However, in a few seconds, I see an exclamation in the navbar at the top (to the left of hostname). When I click on the exclamation, I see an error stating " Encountered an error when processing blacklist regex filter with ID 10:". I am including a screenshot of the error, as well as the exclamation mark in the navbar.
