Maskedtextbox use validatingtype
You can also apply formatting validation to a textbox question after the fact on the Validation tab.
If you select a numeric validation, you can choose to Force Whole/Positive Numbers and/or Allow Values Between a minimum and maximum range.
When using Textbox questions, often times you'll want to validate the data your respondents enter.
It makes analyzing, reporting and then acting on your data easier when it all conforms to certain formatting.
Add your example format in the Additional Instructional Text field and click Save Question.
These choices will automatically apply answer formatting that can be adjusted from the Validation tab.These patterns are commonly used to ensure the data collected is properly formatted.