Here's an algorithm that doesn't suffer from the problem mentioned in the Note above:

my @list = ('10.1.1.[1..2]', '10.2.2.[1..2]', '10.3.3.[3..6]');

my @list_prime = 
   map {
      my $n = $_;
      $n =~ s/\[(\d+)\.\.(\d+)\]//;
      [ $n, $1, $2 ]
   } @list;

my @ordered_list;

my $done;
do {
   $done = 1;
   foreach (@list_prime) {
      next unless defined($_);
      if ($_->[1] > $_->[2]) { undef($_); next }
      push(@ordered_list, $_->[0].($_->[1]++));
      $done = 0;
   }
} while (!$done);


use Data::Dumper;
print Dumper(@ordered_list);

__END__
output
======
$VAR1 = '10.1.1.1';  # First  from first.
$VAR2 = '10.2.2.1';  # First  from second.
$VAR3 = '10.3.3.3';  # First  from third.
$VAR4 = '10.1.1.2';  # Second from first.
$VAR5 = '10.2.2.2';  # Second from second.
$VAR6 = '10.3.3.4';  # Second from third.
$VAR7 = '10.3.3.5';  # Third  from third.
$VAR8 = '10.3.3.6';  # Fourth from third.

[download]

It can probably be optimised.

In reply to Re^2: intermix list of items by ikegami
in thread intermix list of items by tstock

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.