e.g. isPassportNumber, etc.

type Item struct {
	Bt int `valid:"range(1|100)"`
}

func main() {
	t := Item{-1}
	ok, err := govalidator.ValidateStruct(t)
	fmt.Println(ok, err)
}

output:Bt: Validator range(1|100) doesn't support kind int;

TODO

If someone wants to contribute, this is a good first issue

Parameters should be able to support these declaratively.

I'm thinking along these lines:

params do
  requires :name, :string, only: ~w(john mary)
  requires :profession, :string, except: ~w(student engineer)
  requires :email, :string, matches: ~r/.+@.+/
end

The best place to introduce this is during the schema definition step.