Regex to *not* match any characters

Question

I know it is quite some weird goal here but for a quick and dirty fix for one of our system we do need to not filter any input and let the corruption go into the system.

Answer 1

^ is only not when it's in class (such as [^a-z] meaning anything but a-z). You've turned it into a literal ^ with the backslash.

What you're trying to do is [^]*, but that's not legal. You could try something like

" {10000}"

which would match exactly 10,000 spaces, if that's longer than your maximum input, it should never be matched.