Is it possible to recognize only alphanumeric characters in en-US (only uppercase/lowercase letters & integer numbers) ? If so,which configuration files can I add?
Yes it is possible, it requires to build a specific resource file for this kind of use case. Unfortunately you don’t have the ability to build it yourself on our developer portal at the moment.
Depending on the timeline of your project, don’t hesitate to fill in our sales form: https://developer.myscript.com/atk-quote-request