The file is structured like this:

<28 Jan 2014 00:08:24> 00001 startmessage1
<28 Jan 2014 00:08:24>00001 msg1
<28 Jan 2014 00:08:24>00001 msg1
<28 Jan 2014 00:08:24>00001 startmessage2
<28 Jan 2014 00:08:25>00001 msg2
<28 Jan 2014 00:08:25>00001 msg2
<28 Jan 2014 00:08:25>00001 msg2
<28 Jan 2014 00:08:25>00001 msg2
<28 Jan 2014 00:08:25>00001 msg2
<28 Jan 2014 00:08:26>00001 msg2
<28 Jan 2014 00:08:26>00001 Endmessage2
<28 Jan 2014 00:08:26>00001 msg1
<28 Jan 2014 00:08:26>00001 msg1
<28 Jan 2014 00:08:27>00001 startmessage3
<28 Jan 2014 00:08:27>00001 msg3
<28 Jan 2014 00:08:28>00001 msg1
<28 Jan 2014 00:08:28>00001 msg1
<28 Jan 2014 00:08:30>00001 Endmessage1
<28 Jan 2014 00:08:31>00001 msg3
<28 Jan 2014 00:08:31>00001 msg3
<28 Jan 2014 00:08:31>00001 msg3
<28 Jan 2014 00:08:31>00001 Endmessage3
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Date and time, ID, log message... have to find the start message and corresponding end message to culculate the timing. output should be

28 Jan 2014 00:08:24 |startmessage1 |Endmessage1 |00001| 6 seconds
28 Jan 2014 00:08:24 |startmessage2 |Endmessage2 |00001| 2 seconds
[download]

print 'THREAD ID,LOG DETAILS'."\n";

     foreach my $filename (glob("$dir/*.out"))
        {
          open(my $fh, "<", $filename) or die "Could not open '$filena
+me'\n";

                while ($line = <$fh>)
                {
                        my $i=2;
                        chomp($line);

                         if($line=~ $startmsg[$i])
                        {
                                chomp ($line);
                                my $threadid=$line;
                                $threadid =~ s!(\d*)\s*.*!$1!;
                                my $startdetails=$line;
                                $startdetails =~ s!(\d*)\s*(.*)!$2!;
                                chomp($threadid);
                                print "$threadid,$startdetails \n";
                                my $flag = 'False';

                               OUTER:  while ($line = <$fh>)
                                {
                                        if ($line=~ m/$threadid/)
                                         if($line=~  $endmsg[$i])
                                                {
                                                chomp ($line);
                                                my $enddetails=$line;
                                                $enddetails =~ s!(\d*)
+\s*(.*)!$2!;
                                                print "$threadid,$endd
+etails\n";
                                                $flag='True';
                                                last OUTER;
                                                }

                                        }
                                }
                        }

                }
                 close($fh);
        }
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Please help me