On Linux, the adblock definitions have been spamming my (systemd-journal) logs.
I get both
opera-developer.desktop[319503]: E0000 00:00:1782236318.316059 1 re2.cc:242] Error parsing '/img/(?!new).+.gif': invalid perl operator: (?!
and
opera-developer.desktop[256280]: E0000 00:00:1782156574.776787 1 re2.cc:242] Error parsing '^https?://[-a-z]{5,13}.[a-z]{3,6}/[0-9a-h]{1,17}?[0-9a-zA-Z]{1,22}=[%0-9a-zA-Z]{200,1300}': invalid repetition size: {200,1300}
about 10000 times per day (!).
I commented them out in .config/opera-developer/adblocker_data/1776F3BF15261DACC49D7AFCF4D66B9EF6C64023021B7F1585552A71B5800530.easylist
but wish you would do so. (Or did I install UBlock Origin? I think not!)