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J: document an edge case
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rld '12W1B12W3B24W1B14W'
WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW</lang>
Note that this implementation fails for the empty case. Here's a version that fixes that:
<lang j>rle=: ;@(<@(":@#,{.);.1~ 2 ~:/\ (a.{.@-.{.),])</lang>
Other approaches include using rle ::(''"_) or rle^:(*@#) or equivalent variations on the original sentence.
=={{header|Java}}==
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