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<form>
        <input type="text" ng-model="newEmail" />
        <input type="text" ng-model="confirmEmail" ng-match="newEmail"
</form>

app.directive('ngMatch'...
require: 'ngModel',
...
link: function(scope,element,attrs,ngModel) {
         ngModel.$validators.passwordCharacters = function(value) {
                var newEmail = ////how to get newEmail model from the attribute////

                return newEmail === value;
        });
}
...
)