It shouldn’t require them. I thought I saw a comment by the author explaining why they chose to use them, but there’s been like six different threads on three different forums and I can’t find it right now...

I know some C++ folks were annoyed it’s using regex due to criticisms of the standard regex libraries that can’t be fixed, or something, so it’s also not like folks agree that the original solution was optimal. I don’t think it was trying to be, so seems fine, but it is what it is.