For Each Loop to get Specific Files and exclude if file contains $

Good day,

I have a foreach loop to get specific files, i search file cotianing M8 " *M8*.* "

i now have to exclude files that has "M8" and "$" and only import those that has M8 with no $

Should i in my foreach loop, dummy script task with contstraint: FINDSTRING(@FileName,"$",1) = 0

Kindly Advise?

Regards