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                                Hello Thom,

                                Please refer to the ASPxTextBox - How to allow null value when a regular expression and a mask are applied thread. It describes how to accomplish a similar task.
                                While this solution uses ReqularExpression, it is not a requirement: the main idea is to specify an optional numeric mask with the "9" character: Mask Types.

                                • ThomUnger 12.03.2019

                                  Thank you.  Missed that one in my googling.

                                • Helen (DevExpress Support) 12.03.2019

                                  You're welcome!