Here is a regex-based solution. As Anonymous Monk has pointed out, the non-greedy quantifier ? is an important component. But to get all the matches, you need to loop:

#! perl
use strict;
use warnings;

my %matches;
my $s = 'zzAAABCDAAADCBAAABBDAAA';
my $t = $s =~ s/^[^A]*?(AAA.*)/$1/r;

while ($t =~ /^AAA.+?AAA/)
{
    my $u = $t;

    while ($u =~ /^(AAA.+?AAA)/)
    {
        my $match = $1;
        $match =~ s/\|/AAA/g;
        ++$matches{$match};
        $u =~ s/(AAA.+?)AAA/$1\|/;
    }

    $t =~ s/^AAA.+?(AAA.*)/$1/;
}

print $_, "\n" for sort keys %matches;

[download]

Output:

 0:15 >perl 563_SoPW.pl
AAABBDAAA
AAABCDAAA
AAABCDAAADCBAAA
AAABCDAAADCBAAABBDAAA
AAADCBAAA
AAADCBAAABBDAAA

 0:23 >

[download]

The inner loop finds successively longer matches by changing the AAA at the end of each match into a non-word character. The outer loop truncates the search string by removing everything up to the second AAA.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: Perl Pattern Matching & RegEx's by Athanasius
in thread Perl Pattern Matching & RegEx's by jaiieq

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.