Yes!

Prefer this to the single line solutions, much easier to read :)

\w also ignores ö,ä,ß. It only matches [A-Za-z0-9_]

Pretty clean, without having to resort to regex dark wizardry. However, seems to dodge the problem's intent.

Without them I can put a '.' at the begining or end

😡

So neat. Next time I will string multiple conditions together. Thanks for sharing!

How does this work?

+1 for readability and best practice, but this answer violates the specified constraints, which were implied by the message "answer goes here" placed between a single pair of slashes.

Maybe, but it does it in four tests instead of one. Doing it all with one test was the point of this exercise.

Where does it say that? I don't even think this was implied anywhere. No clue where you got this idea.