Flutter secure form string validation

Question

I'm wondering how do you guys secure user input strings in Flutter forms.

I'm using string_validator package to protect the email fields and for regular text fields I was using isAlphanumeric checker, but this don't allow the user to use latin alphabet...

It would be nice to hear about your solutions. Thanks in advance!

Answer 1

I use the inputFormatters and a WhitelistingTextInputFormatter class with RegExp checking.

        inputFormatters: [
          WhitelistingTextInputFormatter(RegExp("[a-zA-Z0-9 ]"))
        ];