One thing I found useful using regex is to use the flag 'i' to make it case insensitive.
instead of /[aeiouAEIOU]/ , /[aeiou]/i

This isn't a best practice. The time is 0(n^2)

Well that's clever.

Hmm, this doesn't seem to pass.

One of the better 7kyus I've tackled here. Thank you to the author; a kikuyu I might add. Thanks Ken.

For sure, one of the better 7 kyus in here. Good job author!

Enjoyed playing around with this kata. Thank you to the author.

Logs in R are unusable:

Test Failed
	number(a) not equal to sol(a).
	Modes: list, character

Not an issue. Tags are often set automatically and cannot be changed.

Thanks :)

One of the better 7kyus in here.

Thanks!

Thanks. Fixed