Where can I find Regex Errors documented?

Using Swift
1

I'm trying to write error handling for a regex which comes from the user, so I need to be polite, and say what I can. However, I can't seem to find any documentation on what errors regex might throw. Where am I supposed to look?

(I can't even figure out where the Regex sources are, which is its own problem.)

2

Regex is implemented in the now-unfortunately named swift-experimental-string-processing repo.

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