My golf solution for this:
$s1 = 'abbbcddddfegrgrgddeeeeedd';
print"$s1\n\n";($s2=$s1)=~s/((.)\2*)/$1,/g;map{$i=index($s1,$_);$l=len
+gth;print
'-'x$i,$_,'-'x(length($s1)-$i-$l),"\n";substr($s1,$i,$l,','x$l);}sort{
+length$b
<=>length$a}split(/,/,$s2);
update: shorter now
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