gnus-parameters for topics

[Pranav K. Tiwari]

I use gnus-parameters to set group properties. A snippet of my
configuration is attached below.

(setq gnus-parameters
      '(("^nnimap.*INBOX$"
         (expiry-target . "nnml:expired.%Y-%m")
         (visible . t)
         (expiry-wait . immediate))
        ("^nnimap.*work*$"
         (expiry-target . "nnml:expired-work.%Y-%m")
         (visible . t)
         (expiry-wait . immediate))))


I believe gnus-parameters can be used with topics as well - as the info
says. Can someone give me an example? I have a topic "1Urgent" and I want
to set expiry-target for all the groups under that topic, I tried the
following:

(setq gnus-parameters
      '(("^nnimap.*INBOX$"
         (expiry-target . "nnml:expired.%Y-%m")
         (visible . t)
         (expiry-wait . immediate))
        ("^nnimap.*work*$"
         (expiry-target . "nnml:expired-work.%Y-%m")
         (visible . t)
         (expiry-wait . immediate))
         (setq gnus-parameters
      '(("^nnimap.*INBOX$"
         (expiry-target . "nnml:expired.%Y-%m")
         (visible . t)
         (expiry-wait . immediate))
        ("^1Urgent$"
         (expiry-target . "nnml:expired-urgent.%Y-%m")
         (visible . t)
         (expiry-wait . immediate))))))
         
But that didn't make a difference.

1. Can someone share an example of using gnus-parameters for topics?

2. How does gnus resolve the conflicts in gnus-parameters? Does it apply
   parameters based on first match in the list, last match, best match ..

TIA.
-p



-- 
Pranav Tiwari.