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#Perl5
$rpn = "3 10 * 20 5 / +";
...
1 while($rpn =~ s/^(.*?)($dig)($dig)($op)/$1.($f{$4}->($2,$3))/e);

print "$rpn\n";

//Haskell
main = print $ foldl eval [] $ words "3 10 * 20 5 / +" -- 34
...
eval (x:y:xs) "*" = y*x : xs
eval (x:y:xs) "/" = y`div`x : xs
eval  xs      dig = (read dig):xs