filtering nearly-identical headers in one rule

(please reply directly to me [honza(_at_)ied(_dot_)com] -- I'm not subscribed 
to the list)

 Hi.

 What would be an [elegant] way to process almost-same msgs in one rule :

 e.g. all the relevant msgs have :

X-loop:  
mailing-list-XXXXX(_dot_)*XX-digest(_at_)an(_dot_)insti(_dot_)tution(_dot_)edu

   And I would like to use lockfile and destination mailbox :
 digest-XXXXX.*XX.lock
   and
 digest-XXXXX.*XX

  where the XXXXX.*XX may be different in different msgs.


I'm using :
procmail v3.10 1994/10/31
         
         Thanx,   
                  Jan

(BTW, does this list have a [searchable] archive somewhere ?)