Using uppercase of regex breaks \d

[timotheeandres]

Currently using whatdaybob/sonarr_youtubedl:dev from docker, I have an issue with the title regex in the configuration. I checked, and the same issue is present in main.

I would like to have a regex that can contain an episode number, such as this: Ep. \\d+ | \g<1>. However, the code currently transforms the regex to uppercase, which changes the meaning of the regex: \d is a digit, whereas \D is a non-digit.