Correct use of regexp
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Steven Lord on 13 Feb 2018
x = char(randi([0 1], 1, 20)+'0')
y = regexprep(x, '0+', '$00')
J Smith's answer doubles the length of each run of 0's in x. Mine adds one 0 to the end of each run of 0's. In the case where all the runs are of length 1 they are the same. They aren't the same when you have runs of length greater than 1.