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Notice that for a phone number user can input a '+' sign, a dash '-' or a space ' '

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Choose something or choose not. what shall it be?

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This is a multifield, which let the user input a serial number or credit card number for example, and the trick is to validate the combined result, which is stored in a hidden field

There is a hidden "Required" form field below, notice it will not be validated due to its lack of visibility. The reason for this is that sometimes there is a section in a form that is not visible until some action is taken, but you do not want to change all those fields' "required" attributes on-the-fly, so that is why.