use warnings; use strict; my $str = '1234567890'; my @unpacked = unpack 'A1 x2 A1 X2 A1', $str; print "@unpacked";

Prints:

1 4 3

A1 gets the first character (1), x2 skips two (23), A1 gets one character (4), X2 backs up two characters (43), A1 gets one character (3).

BTW print "@unpacked"; prints the elements in @unpacked with spaces between them as print join ' ', @unpacked; would.


DWIM is Perl's answer to Gödel

In reply to Re: template in unpack by GrandFather
in thread template in unpack by uva

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.