Rated 4 out of 5 stars

great tool to get better and more refined filters but would it be possible to add regex to attachment name?
e.g. I need to only filter mails with attachments O-(\d)+-(TRA|PRF)-\d+\.pdf so they can be automatically printed

Sure, may be a good idea; attachment support is a little ropy at the moment anyway and needs a number of fixes - can you raise an issue here please?
https://github.com/RealRaven2000/FiltaQuilla/issues