title: Check if two Strings share a common substring in JavaScript
body: <p>Is there any fast way in JavaScript to find out if 2 Strings contain the same substring? e.g. I have these 2 Strings: &quot;audi is a car&quot; and &quot;audiA8&quot;.</p>
  <p>As you see the word &quot;audi&quot; is in both strings but we cannot find it out with a simple <code>indexOf</code> or RegExp, because of other characters in both strings.</p>