A similar one is here.
http://www.mathworks.com/matlabcentral/cody/problems/40-reverse-run-length-encoder
You didn't restrict yourself to using only 0-9 in your sequence, though.
Same as Problem 55 Counting Sequence.
The best solution without regexprep.
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I've got the power! (Inspired by Project Euler problem 29)
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