I am really puzzled by this riddle so I'm wondering if anyone else can solve it.
Here's the puzzle:
The question is what is the number and why.
I don't know the answer, but you just reminded me of regular expressions. Excuse me while I go finish puking.
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."