Folder Compare: How to exclude *.txt except for a.txt ?

[B2C]

Folder Compare:
How to exclude *.txt except for a.txt ?

What I tried:
---------------
Include:
*.*
a.txt

Exclude:
*.txt
---------------
Didn't work.

[Aaron]

The exclusion rule would override the include, but would a rule of something like this work?:
-*[^a].txt

[B2C]

Actually what I want is:
---------------
Include:
*.*
Some .txt files whose names are ruleless strings.

Exclude:
*.txt
---------------

[Aaron]

Sorry, BC4 does not have that level of conditional filtering. It would need to be a specific definition. Otherwise, you could complete this in a two-pass approach as a workaround: Include only the specific .txt files and deal with them, then exclude all text files and work with the rest of the data. I've added this use case to our wishlist.