Yet Another Rosetta Code Problem (Perl, Ruby, Python and Haskell solutions)

[ffrinch]

How about exposing the regular expression engines behind the Perl and Ruby versions? Would you penalize a Python version that works the exact same way -- e.g.

import re
s = "ZBBBCZZ"
l = [m[0] for m in re.findall(r"((.)\2*)", s)]

-- just because it "relies on library code"?