Also a group separator character followed by a non-digit is not.

Change-Id: Id57e43fe7692706c5532fb05ad394224265c2750
Reviewed-on: https://gerrit.libreoffice.org/64358
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>
(cherry picked from commit a4146c38)
Reviewed-on: https://gerrit.libreoffice.org/64367