This is runlength encoding(RLE), searching the web for such might help. There is mention of a perl module Marshal::Packed (by MUIR) which does RLE, but it is does not appear to be available anywhere.

In reply to Re: Converting BCBCBCBCBCCCB to (BC)^{5}CCB by belg4mit
in thread Converting BCBCBCBCBCCCB to (BC)^{5}CCB by fishfork

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