Numeric with comma

Question

This solution has been helpful for me, however I am still missing something.  I need to restrict other specify boxes as well as grid rows to only allow numbers and commas (they are various questions that require a currency response). When I try to implement the regex similar to the one that allows optional decimal points (replacing with comma), the question allows both letters and numbers, and will only show the error message if there are no numbers.

How should I adjust the JavaScript to allow respondents to put in only numbers and commas?

var resp = SSI_GetValue('[% QuestionName() %]_3_other');
var regex = /([0-9]+,?[0-9]*)|([0-9]*,?[0-9]+)/;
if (resp && !regex.test(resp)) {
    strErrorMessage = 'Error.';
}

Answer 1

This regular expression will allow only numerical characters and commas:

/^[0-9,]*$/

This more complex regex will allow only numeric characters with commas every three characters from the right:

/^[0-9]{1,3}(,[0-9]{3})*$/