I'm trying to exclude files like:
file.7z.001
file.7z.002
....
I've created a regexp like this (I'm skipping the angle brackets since BB doesn't seem to like them):

but it doesn't work. Looks like it doesn't recognize dot in the name of the file when it's used like "\."
After many attempts I've managed to find a workaround that works:

Basically i'm checking for the class of characters consisting of a single dot character.
Any idea why the first one doesn't work?

there is a bug in clamwin that changes all \ to / in regexps. A patch is here:
http://files.clamwin.com/clamwin.zip

Please download it and overwrite the old clamwin.zip file in c:\program files\clamwin\lib\ folder.

Yes, this seems to help! Thank you!

we will release a mainstream update after a while. There are some other changes, main being all files are now scanned in UNC naming format internally - this allows to open files that would otherwise fail due to invalid filename characters.

Would you like to beta test it?

I don't have problems with this sort of files (or maybe I don't have such files). So I won't be able to tell if it's fixed or not. But of course I can run it just to see if anything else is broken. Sure, count me in.

well, we need general testing of this change too especially in the regex area as the filename format changed internally.

Please subscribe to the Beta Testers group here:
http://forums.clamwin.com/groupcp.php

After that you will have access to a private "Beta Test" forum in the "development" section

Done. Still can't see "Beta Test" forum under "Development". Just Feature Requests and Translations.
(Sounds like beta-testing forum )

try now, I approved your group membership

Yes I can see that I'm approved but I still don't see "Beta Test" forum in the list of forums. Unless I missed some secret link.

I messed up with permissions, sorry. Should be ok now

yes, works fine. I've subscribed to that single sticky message to be notified on beta releases.