HelloWorldValidationRegistry.cs

public class HelloWorldValidationRegistry : ValidationRegistry
    {
        public HelloWorldValidationRegistry()
        {
            AppliesTo
                .ToThisAssembly();

            Models
                .IncludeTypes(t => t.Namespace.StartsWith(typeof(ModelMarker).Namespace))
                .Exclude<ModelMarker>();

            this.UseValidationAttributes();
            this.InheritValidationRules();

            Rules
                .IfProperty(p => p.Name.ToLower().Contains("email"), validate => validate.AsEmail())
                .IfProperty(p => p.Name.ToLower().Contains("phone"), validate => validate.AsPhoneNumber())
                .BuildDependenciesWith(ObjectFactory.GetInstance);

            Extensions
                .IncludedExtensionsInNamespaceContaining<HelloWorldValidationRegistry>();
        }
    }

UserValidationExtension.cs

    public class UserValidationExtension : IValidationRegistryExtension
    {
        public void Configure(ValidationRegistry registry)
        {
            registry
                .Rules
                .For<UserInputModel>()
                .Require(u => u.Password)
                .Require(u => u.ConfirmPassword)
                .Compare(u => u.Password, u => u.ConfirmPassword);
        }
    }