Broken compability with ng-pattern in Angular 1.3.19 and later

[piotrl]

Hi,
great library, our users are happy to use it ;)

Recently I've upgraded Angular from 1.3.12 to 1.5.8 and found out that validating with ng-pattern doesn't work anymore.

Reason is in change introduced in 1.3.19, that ng-pattern directive validates $viewValue instead of $modelValue - Reference in changelog.

It is not specifically problem in ui-mask, the behavior is the same in version 1.2.0 to 1.8.6.
This issue is extension of #165 which contains solution only for specific RegExp.

Workaround for that is to use custom directive provided by angular team, I've described it in this StackOverflow thread - Angularjs ui-mask with ng-pattern.

I've created plunker with broken example - Plunker.

Maybe adding support for this directive inside of ui-mask with examples in doc might be go to solution?