^ad([sxv]?[0-9]*|system)[_.-]([^.[:space:]]+\.){1,}|[_.-]ad([sxv]?[0-9]*|system)[_.-]
^(.+[_.-])?adse?rv(er?|ice)?s?[0-9]*[_.-]
^(.+[_.-])?telemetry[_.-]
^adim(age|g)s?[0-9]*[_.-]
^adtrack(er|ing)?[0-9]*[_.-]
^advert(s|is(ing|ements?))?[0-9]*[_.-]
^aff(iliat(es?|ion))?[_.-]
^analytics?[_.-]
^banners?[_.-]
^beacons?[0-9]*[_.-]
^mads\.
^pixels?[-.]
^count(ers?)?[0-9]*[_.-]
- This expression has been removed because it was blocking access to counter-strike.net.^stat(s|istics)?[0-9]*[_.-]
- It is blocking access to stats.uptimerobot.com
https://github.com/mmotti/pihole-regex/blob/master/regex.list