Expression to scan for set of Keywords in the input text

Need help in writing an expression (JUEL expression is preferred) that can be entered as Input Entry in the DMN table

Requirement -
The expression shall match (true) only when the following keywords are NOT found in the input string.
The variable name is “userfeed”. I have tried with the following JUEL expression, but it didn’t work.

${ ! (userfeed.contains(“ABC123”) || userfeed.contains(“XYZ456”)) }

I figured out that the variable name is wrong in the expression.
It worked after correcting the variable name.