image-dired-mark-tagged-files
image-dired-mark-tagged-files is an interactive autoloaded compiled Lisp function in `image-dired.el
'.
(image-dired-mark-tagged-files)
Use regexp to mark files with matching tag.
A `tag' is a keyword, a piece of meta data, associated with an
image file and stored in image-dired's database file. This command
lets you input a regexp and this will be matched against all tags
on all image files in the database file. The files that have a
matching tag will be marked in the dired buffer.