How to block if it doesn't contain keyword

[ddaaii]

How do I block elements if it doesn't contain keywords instead of the default 'blocking if it contains'?

[andreicaba]

Indeed, how do you do that?... Tried the regex !(.keyword to be contained.) and... it didn't work(!)...
Does the regex work?!...

[andreicaba]

Nevermind, I actually did it with Regex. I checked both „Complete Match” and „Regex” and then used something like this:

^((?!keyword).)*$

by the way, for some reason the escaping char can't be added there (this char: \ )