#1 [111.123.164.80]  [123.126.126.126] 87 #000:00:00.0000.000.000     
+0
#+6/07/2000 04:39:00 PM SNMP: Get

           # Guess you have to ( pattern ) to store and use it with $1
+,$2,$3 , in your code you match it but you do not store it and hence 
+print the line by itself



                  if ($_ =~ /(\[.*\])\s+(\[.*\]).*(SNMP: Get$)/){
                        print "[$1] [$2] [$3]\n";

                  }
[download]

          # $_ =~ s/(\[.*\]) 
                             #match within first [ 
                             #charachters inside it ]
          #        \s+         
                             #match a space after this
          #        (\[.*\]).*  
                             #match again for the second [ 
                             #charachters inside it ]
          #        (SNMP: Get$)/; 
                             #match the SNMP part of
                             # the string 
          #        print "$1 $2 $3\n";
[download]