How to create a Alpha numeric Field

[Robot]

I want to create an alpha numeric field in my custom doctype. How can I achieve that? Has anyone done that?

[Antony_Praveenkumar]

Use some kind of validation in the in the JS. use form script.

https://frappeframework.com/docs/user/en/api/form#:~:text=Triggered%20when%20the%20value%20of%20fieldname%20is%20changed