Input validation in GoLang junior approach

junior_goper.go

package user

const regexpEmail = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")

type User struct {
	Email string
	Name  string
}

func (a User) IsValid() (errs url.Values) {
	// check if the name empty
	if a.Name == "" {
		errs.Add("name", "The name is required!")
	}
	// check the name field is between 3 to 120 chars
	if len(a.Name) < 2 || len(a.Name) > 40 {
		errs.Add("name", "The name field must be between 2-40 chars!")
	}
	if a.Email == "" {
		errs.Add("email", "The email field is required!")
	}
	
	if !regexpEmail.MAtch(a.Email) {
		errs.Add("email", "The email field should be a valid email address!")
	}
	return errs
}