I hope I'm not too annoying, but I have another question. How do I deal with enums? https://docs.pact.io/getting_started/matching/gotchas#i-have-a-problem-of-which-i-solved-with-regex-now-i-have-two-problems assumes the usage of a regular expression, which would have been my guessed as well. But if I want to make sure, that the provider will actually use all the right values, I will have to create a contract test for each of the possible enum values, right?

If you really need to test each scenario, then yes, that’s the only way (because you would need to test the consumer can satisfy each of those scenarios with a test anyway).