(gnus-group-decoded-name group)))
(let ((regexp "[][\C-@-\t\v-*,/:-@\\^`{-\C-?]*\
\\(nn[a-z]+\\(?:\\+[^][\C-@-*,/:-@\\^`{-\C-?]+\\)?:\
(gnus-group-decoded-name group)))
(let ((regexp "[][\C-@-\t\v-*,/:-@\\^`{-\C-?]*\
\\(nn[a-z]+\\(?:\\+[^][\C-@-*,/:-@\\^`{-\C-?]+\\)?:\