You could do it this way. I'm using a manual position rather than utilizing the default characteristics of /g. I advance the position by one character each time through the loop. And if I get a match, I advance it by one plus the offset of the beginning of that match. It probably could be golfed down a lot (for instance, the use of $sstr is unnecessary; substr can be bound directly to the regexp. And there is probably not really a need for the "else" condition in the loop, but I just wanted to cover all bases and make it as clear as possible. Here it is... 
use strict;
use warnings;
my $string = "aabbaaaabbaaabbbbabaabbbaaaa";
my @a;
my $position = 0;
while ( $position < length $string ) {
    my $sstr = substr($string,$position);
    if ( $sstr =~ /(aa)/ ) {
        push @a, $1;
        $position+=$-[0]+1;
    } else {
        $position++;
    }
}
print join("-", @a), "\n";

[download]

Dave


"If I had my life to do over again, I'd be a plumber." -- Albert Einstein

In reply to Re: multiple matches with regexp by davido
in thread multiple matches with regexp by almaric

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.