create collection based on file names

[kofa (István Kovács)]

Maybe this workaround would be usable for you?

1. Quit darktable
2. Run a SQL similar to the one outline here: How to filter for a month? - #21 by Pascal_Obry
   You’d have to replace the where clause in the SQL.
3. Start darktable, and do whatever you want with the selected images (e.g. assign a tag you can later use to select them again).

You could even assign the tag directly via the DB.