#### Bug, feature request, or proposal: bug #### What is the expected behavior? filter all countries #### What is the current behavior? after typing [ in the input the auto complete stops working #### What are the steps to reproduce? type [ in your example Providing a Plunker (or similar) is the *best* way to get the team to see your issue. https://material.angular.io/components/component/autocomplete #### What is the use-case or motivation for changing an existing behavior? Isn't that obvious?