I'm justifying what StoppingBuck said. Sometimes regex isn't the best practice. In this case, however, it would appear to be.

So, what you're saying is, your statement has no bearing on the kata at hand.

"so sometimes it isn't the best way to do things"

Key word: sometimes

Javascript can be very slow, so sometimes it isn't the best way to do things.

Haskell can be very slow, so sometimes it isn't the best way to do things.

Lists can be very slow, so sometimes they aren't the best way to do things.

Arrays can be very slow, so sometimes they aren't the best way to do things.

Arithmetic can be very slow, so sometimes it isn't the best way to do things.

It's a tool. You use the appropriate tool for the appropriate situation. This is an appropriate situation for regex.

Regex can be very slow, so sometimes it isn't the best way to do things.

Ahh... I love the sight of regex in the morning. This one is genius. Not sure if it's best practice (as it's perhaps a bit opaque), but definitely clever!