G'day ibm1620,

The @{[...]} construct is one of many that are referred to as "Perl secret operators and constants".

This one, called "Baby cart", has been around for a very long time. Follow that link for an answer to your question as well as other information.

I have been using it since the 1990s and, as I recall, wasn't even aware that it was a perlsecret until much later. I think I first encountered it in one of the "O'Reilly Perl books". I don't remember which one; although, "Advanced Perl Programming" is a likely candidate. Note that's the original edition; "Advanced Perl Programming, 2nd edition" is completely different — a very poor choice of title in my opinion.

— Ken

In reply to Re^5: Check if key exist in hash but not exact match by kcott
in thread Check if key exist in hash but not exact match 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.