Exclude folders that begin with "." from index

[bitpow]

How do I exclude folders that begin with a dot, or period, from being indexed?

For example, I want to exclude all folders named ".hg" and ".metadata" and ".this" and ".that" when Everything scans my drive.

All obvious filter entries don't seem to work.

Thanks

[dan_pub]

on my machine, this seems to do the job:
folder: \.

[bitpow]

Hmm,
That does not appear to work.
I created an Exclude rule "\." for folders only.
".this" and ".that" folders are still being indexed.

Anything else?

[dan_pub]

exclude
filter .*
folders only