Custom Validation to allow only numbers and decimals (no commas or $)

Can you use Custom Validation, with conditions where each field Does Not Contain a comma? Something like this:

That does solve the comma issue, but we want only numerical values to be entered as well. So with the way you suggest, respondents can now enter any character and numerical values, just no commas. 

Are you able to change the Matrix Type selection to “Constant Sum”? If so, that will prevent characters from being entered once they move to the next page.

Hi…

try to use the below js code

might work..

Qualtrics.SurveyEngine.addOnload(function() {
    var table = jQuery("#TABLEID"); // Replace TABLEID with the actual ID of your matrix table
    table.on("input", "input[type='text']", function() {
        var value = jQuery(this).val().trim();
        if (value !== "") {
            if (!/^\d+(\.\d{1,2})?$/.test(value)) {
                jQuery(this).val("");
            }
        }
    });
});
 

Use this regex instead on the class

^\d+(\.\d+)?$