Does this work... could it be done better.

I want the following RE to match just the word
subscribe blah blah blah person.mil and not
unsubscribe blah blah blah person.mil

Is this right?  It seems to be working.

:0
* ^From.*\.mil
   {
   :0 B b H h
   * !(un)subscribe testbed.*((\.mil)|(\.dod)|(.gov))
   | ./approve
}