If you don't mind the different order of the output...
... and also don't mind the possible loss of some intended output:
# OP's solution, given a different input:
$ perl -le'print $1 while "ZBBBCZZCZ" =~ /((.)\2*)/g'
Z
BBB
C
ZZ
C
Z
# jwkrahn's solution for that input:
$ perl -le'print for keys %{{"ZBBBCZZCZ" =~ /((.)\2*)/g}}'
Z
ZZ
BBB
C
(Not to mention that the OP approach wins at golfing. :)
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