The line

    if ($row->[0] =~ m{\QHWUSI-EAS95L_0025_FC:3:1:5232:1082#0//E}) {

should have read

    if ($row->[0] =~ m{\QHWUSI-EAS95L_0025_FC:3:1:5232:1082#0/\E}) {

There is a typo in the original code with an incorrect slash before the trailing E. The escaped pair \Q and \E tells Perl (when interpolating) to escape all characters that have special meaning in a regular expression - see Quote and Quote like Operators in perlop. The typo was of course mine, and I have corrected the original post accordingly. With that change, I get the output: 1449586    1449577. Obviously, you should be modifying that matching condition to fit your requirements.

In reply to Re^6: compare lines within a file by kennethk
in thread compare lines within a file by garyboyd

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.