but the matched sub-pattern (.+) is not stored anywhere

Yes it is 

#!/usr/bin/perl --
use strict;
use warnings;
Main( @ARGV );
exit( 0 );
sub Main {
    for my $outer ( 1 .. 3 ) {
        printf qq[%5s %5s %5s %5s \n], qw' out inn flip $1 ';
        for my $inner (1..10){
            my $flip =   $inner =~ /2/ .. $inner =~ /(5)/ ;
            printf qq[%5s %5s %5s %5s \n], $outer, $inner, $flip, $1 |
+|'';
        }
        print "\n";
    }
}
        
__END__
  out   inn  flip    $1
    1     1
    1     2     1
    1     3     2
    1     4     3
    1     5   4E0     5
    1     6           5
    1     7           5
    1     8           5
    1     9           5
    1    10           5

  out   inn  flip    $1
    2     1
    2     2     1
    2     3     2
    2     4     3
    2     5   4E0     5
    2     6           5
    2     7           5
    2     8           5
    2     9           5
    2    10           5

  out   inn  flip    $1
    3     1
    3     2     1
    3     3     2
    3     4     3
    3     5   4E0     5
    3     6           5
    3     7           5
    3     8           5
    3     9           5
    3    10           5

[download]

In reply to Re: saving matching pattern with flip-flop operator by Anonymous Monk
in thread saving matching pattern with flip-flop operator by raja_infy

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.