bug with the char '[' in auto complete

[lilling]

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?

[donroyco]

It also happens when you type * or + or \ or ?.

[willshowell]

See #4921. Should be fixed in next docs release

[kara]

Closing, as this is fixed on master.

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