Is there a way to block users from entering a hyphen in a short answer box?

I use one of the short answer boxes to create a file name but it messes up every time I have someone put a hyphen in the box.

Please check our input masking: https://www.jotform.com/help/381-Getting-Started-with-the-basics-of-Input-Masking. The input mask will force users to enter letters and numbers only. However, this will also prevent them from entering a value greater than the number of masks you have.