I got error messages like TypeError: Missing parameter name at 3: https://git.new/pathToRegexpError and I was wondering how that weird url made it's way into my code

Two suggestions:

1. It doeesn't look like lexer() gets the whole error, so maybe it would be good to wrap those errors in parse() and include the whole string?
2. Make it clear that the url is documentation. Something like For more information about regexp paths check https://...
3. I personally would prefer a link that clearly shows it's going to github instead of a link shortener, but that's just my opinion

If you're ok with me changing 1 and 2, I'm happy to prepare a pull request