Certainly you can, and there are any number of ways to do it. One of the simplest might be to read in the whole file and split it on /^Traceroute:/xms and work with the chunks, but if the file is large (or could be large in the future) that may not be the best method. Going with what you have now I'd say do something like... 
while (my $line = <$in>) {
   if($line =~ /^traceroute to (\S+)/) {
       $current_traceroute = $1;
       $count = 0; #reset the count;
       print "Trace for $current_traceroute: ";
   } elsif($line =~ /^\s*\d+\s+/) {
       $count++;
   } elsif($line =~ /^Query:/) {
       print "$count\n";
   }
}

[download]
Basically you want to catch the beginning (and end) of each block and reset things to start a new count and/or pull any other relevant data. If Query: isn't reliably there then you might have to rely on "Traceroute:" or "traceroute to" to signal the end of the previous call, but then you'd have to handle the last route by triggering on eof since there would be no final "Traceroute:". Make sense?

                - Ant
                - Some of my best work - (1 2 3)

In reply to Re: Can I count lines in a substring? by suaveant
in thread Can I count lines in a substring? by maheshkumar

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.