If it's not a joke, it's at least an exercise in absurdity. I wrote a regex that would allow things that aren't facebook, and then you said "No, you're not all

If it's not a joke, it's at least an exercise in absurdity. I wrote a regex that would allow things that aren't facebook, and then you said "No, you're not allowing things that aren't facebook, you're not allowing things that don't match not being facebook". If it's not a white-list, it's at least an opposite-of-black-list.