Re^2: Yet Another Rosetta Code Problem (Perl, Ruby, Python, Haskell, ...)

[jdporter]

Excellent excellent excellent.
A solution to the order problem would be to use an order-remembering hash (e.g. Tie::IxHash). Or you could pluck out the even-numbered elements of the list, e.g.

$_ = 'abbbccddde';
@a =  /((.)\2*)/g;
@a = @a[ grep { not $_ & 1 } 0 .. $#a ];