JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately, it is not possible to do any alphanumeric validations for the configurable list text boxes. The only option currently available is to validate a numeric input value.
Do get back to us if you want to send a feature request to our back end team and we will do the needful.