Regular expression to count number of commas in a string

by 
/^([^,]*,){21}[^,]*$/

That is:

^     Start of string
(     Start of group
[^,]* Any character except comma, zero or more times
,     A comma
){21} End and repeat the group 21 times
[^,]* Any character except comma, zero or more times again
$     End of string

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