Depending on how big the file is and how XML compliant it is, you might also want to use one of the XML handling modules like XML::Simple, or XML::LibXML. They can simplfy things so you don't have to write a bunch of regex's to handle the different tags. Some of them are also designed to handle huge files reasonably efficiently

edit:
realized you aren't rewriting so removed that comment

If it's not XML compliant, the XML parsers might fail on you (they're supposed to), but something like HTML::TreeBuilder or HTML::TokeParser might also be convenient. I've used both for what I think is a similar task, and they're pretty straightforward.

more edit
The XML modules or HTML::TreeBuilder will parse things and maintain all the structure that you're otherwise trying to reconstruct out of the array elements, as BrowserUK suggests.


In reply to Re: Pattern search in a Multiline Record, from a multi-record datafile. by bitingduck
in thread Pattern search in a Multiline Record, from a multi-record datafile. by Anonymous Monk

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.