while (<FH>) {
       print  if (
         (/Btree/../PSE:/) or (m#PROCESSING ../Btree.gz#)
         or
         (m#PROCESSING ../log.dummy-10-05-18-05.gz#)
         or
         (m#PROCESSING ../log.dummy-10-01-06-05.gz#)
       )
    }

----------------------------------------------------