Needs a little more than a regex, I think. Here's my take on it: 
#!/usr/bin/perl -w
 
use strict;
my ($firstQ, $firstS);
my ($lastQ, $lastS);
 
while (!(defined($firstQ) && defined($firstS)))
{
        $_=<>;
        $firstQ=$1 if(/^Query:\s+?(\d+)[\sgcat]*(\d+)/) && do{$lastQ=$
+2};
        $firstS=$1 if(/^Sbjct:\s+?(\d+)[\sgcat]*(\d+)/) && do{$lastS=$
+2};
}
while(<>)
{
        $lastQ=$2 if (/^Query:\s+?(\d+)[\sgcat]*(\d+)/);
        $lastS=$2 if (/^Sbjct:\s+?(\d+)[\sgcat]*(\d+)/);
}
print "First:\t$firstQ\t$firstS\n";
print "Last:\t$lastQ\t$lastS\n";


## Output of large dataset:
#############
First:  11      1
Last:   370     360

## Output of small dataset:
#############
First:  249     64265
Last:   271     64243

[download]

Code works with both a single data item or multiple data items spread across several lines. Now you can make the regexes in the second while loop more efficient by taking out the first capturing parentheses but I wanted to keep them the same as the first while loop so you could see the symmetry and what I was doing with the regex.

HTH

In reply to Re: Regex perplexity by pzbagel
in thread Regex perplexity by eweaverp

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.