directive used for email or password confirmation.

match.js

.directive('match', function($parse) {
  return {
    require: 'ngModel',
    link: function(scope, elem, attrs, ctrl) {
      scope.$watch(function() {        
        return $parse(attrs.match)(scope) === ctrl.$modelValue;
      }, function(currentValue) {
        ctrl.$setValidity('mismatch', currentValue);
      });
    }
  };
});

// <input type="password" name="passwordConfirm" ng-model="$ctrl.user.passwordConfirm" match="$ctrl.user.password" required/>