boolean usage

If this has been discussed before, I apologize for missing it, either
here or in my perusals of the man procmail/ et al.

My question is: Realizing that procmail condition lines are normally
and'ed and *not* or'ed, is it possible that a Boolean operator such as
*NOT* might be used to establish a condition in an rc.script?

For example, something like:

 :2

 * ^From:.*twfic
 * ^Subject:.*NOT*(scripts)     
 {
        ETC.

 }
. . . sorry if this is incredibly flaky; I'm still learning. 


Thanks in advance for any and all help. 


Ty Fairchild