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DataValidation
The base DataValidation that contains properties common to all validations, such as help text.
Validations can be added to certain Form items.
// Add a text item to a form and require it to be a number within a range.
var textItem = form.addTextItem().setTitle('Pick a number between 1 and 100?');
var textValidation = FormApp.createTextValidation()
.setHelpText(“Input was not a number between 1 and 100.”)
.requireNumberBetween(1, 100);
textItem.setValidation(textValidation);