Regex - my rule is applied both to folders and files

I am running Toucan 2.2.1 and try to set up a regular expression rule that selects all folders ending with _A (i.e. excludes all folders except those ending with _A). The expression I use is *[^_][^A]$ and select 'Folder to exclude'. The correct folders are selected but no files are selected (except those ending with _A), so it applies the rule also on the files within the folder. This must be a bug.
/Ulf