So some kind of run-length encoding?

No. It relates to this problem.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re^2: Faster regex to split a string into runs of similar characters? by BrowserUk
in thread Faster regex to split a string into runs of similar characters? by BrowserUk

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