Correct: I could have put {2,}, but why bother my keyboard with unnecessary extra work :p?

yes, {2} is all you need to know the characters won't be alternating vowel/consonant.

Of course it does: match of the first alternative in the regex :)

Which one would you consider the best and why?

None of them?

I wrote this kata more than a year ago when I was first learning angular, which has this hackery built-in and center-place.

Now it's the future and I reject the idea that's it's good to use this crazy trick for anything.

Production code should be short, easy to read, and boring, like a Malcolm Gladwell novel. Not like this.

You might consider involving .toString() somehow (like I mention in the hint)

How did you determine the arguments to the original argument in the first place?

What can you so that will work again?