Adding 0 value place holders to string array

Appreciate any help on this challenge. Ive spent a few hours already and havent figured it out. I have a 2500x1 string array. Lets say the first 5 rows look like this:

 "0, 74, 46, 94"
 "7, 64, 8"
 "8, 50, 32, 70"
 "6, 43"
 "3, 55, 47"

How can I add zeros as place holders for the rows that have less than 4 values? I want the result to look like this:

"0, 74, 46, 94"
"7, 64, 8, 0"
"8, 50, 32, 70"
"6, 43, 0, 0"
"3, 55, 47, 0"

Answer 1

[Paul]

s= [
"0, 74, 46, 94"
"7, 64, 8"
"8, 50, 32, 70"
"6, 43"
"3, 55, 47"] 

s = 5x1 string array
    "0, 74, 46, 94"
    "7, 64, 8"
    "8, 50, 32, 70"
    "6, 43"
    "3, 55, 47"

c = count(s,",")

c = 5×1

3 2 3 1 2

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s = arrayfun(@(s,c) join([s,repmat(", 0",1,3-c)],""),s,c)

s = 5x1 string array
    "0, 74, 46, 94"
    "7, 64, 8, 0"
    "8, 50, 32, 70"
    "6, 43, 0, 0"
    "3, 55, 47, 0"

[Lou]

That worked perfectly! Thank you!!!