The following output is far from what I expected.

% darcs diff --from-tag="0.0.7E7F2" --to-tag="0.0.7E7F2-dos-ansi"
Thu Jan 19 20:45:04 SAST 2006  Clive Crous <clive@darkarts.co.za>
  tagged 0.0.7E7F2-dos-ansi
%

This was done using the repository browsable at:
http://usrsrc.org/darcsweb/darcsweb.cgi?r=slashem-dos-ansi;a=summary
and actual repository at:
http://usrsrc.org/darcs/slashem-dos-ansi/

On Thu, Jan 19, 2006 at 07:38:13PM +0000, Clive Crous wrote:
> 
> New submission from Clive Crous <clive@darkarts.co.za>:
> 
> The following output is far from what I expected.
> 
> % darcs diff --from-tag="0.0.7E7F2" --to-tag="0.0.7E7F2-dos-ansi"
> Thu Jan 19 20:45:04 SAST 2006  Clive Crous <clive@darkarts.co.za>
>   tagged 0.0.7E7F2-dos-ansi
> %

Unfortunately for you the output is exactly what you should
expect.  ;^)

The problem is that --to/from-tag take regular expressions and
pick the last matching patch.  In this case the from-tag regex
matches the same tag as the to-tag regex.  Use a $ sign at
the end of the from-tag regex to match the "first" 7E7F2 tag.

my appologies, damn, I work with darcs daily and *know* those are regex, I don't
know what possessed me.

It works 100% as it _should_