gnus-notify.el; Question about manipulate the displayed groupname in the Modeline

[physiculus]

Hello,
i want to use notifications of new mail for several groups inside my
accounts with gnus-notify.el and tweak the displayed groupname in the modeline.
Someone some years ago answered this with tweaking the regexp to view
the groups here:
https://stackoverflow.com/questions/1053245/new-mail-notifications-in-gnus-for-emacs

But unfortunately he didn't wrote how to do that in detail.

Does anybody know how to tweak this?

If i edit it through "G p" for every group it works, but it displayed
only one letter, e.g. .W for [Gmail]/Wichtig. If i understand the answer
from stackoverflow correct, i could manipulate this text through regexp
inside gnus.

Regards
Poul