How do analyse a string variable?

Hello, in my game the user enters his name.

I need to check that the name entered has only letters and numbers.

That is, the user can write this:

Carlos123

Charles

4568

The user cannot write symbols:

Charles)(//

{}[]Charles

How do I check that the string only contains letters or numbers?

You can "whitelist" all the characters you want to an array, and use the Array "contains value" every time a new character is entered.

Otherwise there's probably a way via regex.

Hey, thanks I already got it.