Jorge <jorge13515@gmail.com> writes:

> [[info:org#Tag hierarchy]] says:
>
>>    Furthermore; The members of a _group tag_ can also be regular
>> expression, creating the possibility of more dynamic and rule-based
>> tag-structure.  The regular expressions in the group must be marked up
>> within { }.  Example use, to expand on the example given above:
>>
>>      #+TAGS: [ Vision : {V.+} ]
>>      #+TAGS: [ Goal : {G.+} ]
>>      #+TAGS: [ AOF : {AOF.+} ]
>>      #+TAGS: [ Project : {P.+} ]
>>
>>    Searching for the tag `Project' will now list all tags also including
>> regular expression matches for `P@.+'.  Similar for tag-searches on
>> `Vision', `Goal' and `AOF'.  This can be good for example if tags for a
>> certain project is tagged with a common project-identifier, i.e.
>> `P@2014_OrgTags'.
>
> However, the `Project' group tag regex is `P.+', while the first
> sentence in the final quoted paragraph cites the regex `P@.+' (with an
> `@').
>
> Emacs  : GNU Emacs 25.0.92.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.6)
>  of 2016-03-05
> Package: Org-mode version 8.3.4 (8.3.4-34-gacfd41-elpa @
> /home/jorge/.emacs.d/elpa/org-20160411/)
>
> I run Ubuntu 15.10 with PPAs gnome3-team/gnome3 and gnome3-team/gnome3-staging.

This was added with commit ecfd00cd by Gustav Wikström (cc'ed).

The paragraph is in need of some editing, but I think some of the @ signs are
wrong: they are used as escapes in the texi file and a couple of them
are missing. I attach a patch but it could use some review to make sure
it's correct.