Filter files not containing text

[searcher1]

Hi

i want to rename files that do not contain the text "(". in other word, i want to rename files that do not contain an open parenthesis in the file name. In the mask box I put
*!(*
It returned nothing. and it should return a number of files.
What is the correct way to do this.

Thank You

[ovg]

!( or !*(*