How to detect Internet Explorer 11 and below versions?

Question

I\'m wondering how I could detect if the user viewing my website is using Internet Explorer 11 or below versions with Javascript.

It should be compatible and

Answer 1

I'd like to streamline the correct answer. This returns true or false:

function is_IE() {
  return (window.navigator.userAgent.match(/MSIE|Trident/) !== null);
}