I can use the following RegExp to Filter for Titles with open and closed brackets : "$if($eql($regexp(%title%,\(.*\),),%title%),yes,no)" IS no
but when I try to find Titles with two apostrophes it doesn't work: "$if($eql($regexp(%title%,'.*',),%title%),yes,no)" IS no
I thought the problem might have something to do with filtering for the same character but this expression finds Titles with two "z" "$if($eql($regexp(%title%,z.*z,),%title%),yes,no)" IS no
Thanks for your help. I used an extra quotation mark as suggested on the page you linked to and it works. Thanks again
e.g. "$if($eql($regexp(%title%,''.*'',),%title%),yes,no)" IS no