Well, the Perl way is obviously TIMTOWDI, but I have a Perl-ish RegEx way for you ;-): 
$a="aaaa";
$a=~m/(aa)(?{push @a, $1})(?!)/;
print join ( "-", @a );

[download]
This uses (?{}) (just a bit of code within a RegEx that is executed whenever the RE engine runs over it) and (?!) (negative look-ahead), so that it always fails (that's a bit of its magic), both explained in perlre. You could say it is ugly, but I personally like it :-).
Hope this helped.
CombatSquirrel.
Entropy is the tendency of everything going to hell.

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

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