gnus-options-subscribe

gnus-options-subscribe is a variable defined in `gnus-start.el'.
Its value is

nil

Documentation:
*All new groups matching this regexp will be subscribed unconditionally.
Note that this variable deals only with new newsgroups. This variable
does not affect old newsgroups.

New groups that match this regexp will not be handled by
`gnus-subscribe-newsgroup-method'. Instead, they will
be subscribed using `gnus-subscribe-options-newsgroup-method'.

You can customize this variable.