The bonus with that regex is that it kind of looks like a dead clown.

If it were their names, imagine the fun in explaining what happened to 2.

And in a couple years, while introducing them, "Here are our children, 1 and 3. 1 is 3 and 3 is 5."

Reminded me of that old verse (best said out loud):

"Oneone was a racehorse, twotwo was one too. Twotwo won one race, and twotwo won one too!"