negative regular expressions?

[spotter]

I'm wondering if its possible to do negative regular expressions (my attempt at ?! groups didn't work). i.e. find all posts that don't have a yEnc in them.

[Quade]

You can make a filter profile apply "yenc" as a "Subject Reject" filter then when you want to show only posts with no "yenc" apply the filter profile. It'll then hide all posts with "yEnc" in the subject.

[spotter]

yes, I figured that out, just thought there might be value to negative regular expressions as well.

[Quade]

I'm not an RE expert but it feels like it's primarily for matching not rejecting.