Just two quick thoughts for now: open the file with the mode '<:raw' (or binmode the handle after opening but before reading), and add the /aa regex modifier (perlre) to your regexen.

Update: I didn't have enough time earlier to explain why I made these two suggestions, so let me do that now. First, note that on Windows, the :crlf PerlIO layer is active by default, translating CRLFs to LFs, which isn't good for binary data. Also, opens without explicit layers can be affected by the open pragma. Second, if you were to open the file with an encoding layer, under Unicode matching rules (see /u in perlre), \d matches any Unicode digits (see "Digits" in perlrecharclass).

Update 2: Typo fix

In reply to Re: Calculated position incorrect when using regex in text file that also contains binary info (updated) by haukex
in thread Calculated position incorrect when using regex in text file that also contains binary info by geertvc

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.