Can anyone explain how to use Validation configuration for any input field like

Hi,
You can use javascript validation,for more information regarding js validation refer following link.
forum.appian.com/.../Component_Configuration_Properties
But Js Validation is not supported in Mobile enabled forms,one more option will be Masking for simple validations.
For More information regarding masking refer following link.
forum.appian.com/.../Text_Form_Component

But masking is also not supported in mobile enabled forms.

To keep your application mobile-enabled, you can use a rule on the data outputs to check if the value(s) entered comply with your validation conditions and use an XOR to reroute the user back to the form while displaying a conditionally shown error message if the validation conditions are not met.