I can't delete blacklist regex

Hello,
recently I check my pihole and I found in blacklist :http://app0552.dramteam15.live/3667055784/?u=gmqk605&o=55hppzy&t=main7&f=1(^|.)gemius.(com|pl)$.

Problem is that I can't delete this. I try few steps but no result.

any advice please.
Regards

I found the way :
sudo nano /etc/pihole/regex.list sudo service pihole-FTL restart`

regards

I'm not sure how that got into your blacklist, since it is a complete URL including protocol, domain and path.

I don't know also. I deleted this URL. Now i have nothing in blacklist and i hope that is głos.
Regards