Regex matching line not containing the string

I'd like to select a lines with does not contain a word SCREEN. I tried the following regex (?<!SCREEN).+ but it seems not to work - selects all the lines. Why doesn't it work?

2 Answers

The short answer: ^((?!SCREEN).)*$

This is inspired by which contains a full explanation

Another try for this case: (SCREEN){0}.*$

Hope that can help.