I have the issue with [`<md-autocomplete>`](https://material.angularjs.org/latest/api/directive/mdAutocomplete) component which is shown in [this demo](https://jsfiddle.net/dma_k/j9afow1L/3/):

`<md-autocomplete ng-pattern="...">` does not work. I would expect that if some text is entered into `Tax` field (like `zzz`) the field is be marked as red as only numbers [1..99] are accepted by regex `ng-pattern="/^[1-9]\d?$/"`. Actually `required` works fine: when the field is empty, it is triggered as invalid.