Regex not matching in release name

[hwwilliams]

Sonarr version (exact version): 3.0.4.1100
Mono version (if Sonarr is not running on Windows): 5.20.1.34
OS: Docker on Linux
Debug logs: https://hatebin.com/rhrnzhaviu
Description of issue: I have a preferred regex set in a release profile that applies to all shows and it doesn’t seem to match all instances of Dual Audio even though it matches some.

The regex I’m using is dual.?audio|multi.?audio

Regex101 shows it should work fine and it used to work fine but I’ve noticed recently that it isn’t catching every release with Dual Audio in the name.

regex101: build, test, and debug regex

[markus101]

It’s not catching that release because it can’t parse it into a series and episodes.