Correct use of regexp

If x is the following string, I want to add a zero to the end of each sequence of zeros.

x='0110'
y=regexp(x,'[0+]','[0+]$0')

The result should be: x ='001100'

Answer 1

[ES]

y=regexprep(x,'[0+]','00')

[GEORGIOS BEKAS]

it does not work if the string would be: x='00011000'

Answer 2

[Steven Lord]

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.

[GEORGIOS BEKAS]

it does not work