title: What's the meaning of the asterisk when using on the attribute "pattern" of an input?
body: <p>Here's an example:</p>
  
  <pre><code>&lt;input title="Only numbers" pattern="[0-9]*" type="text" /&gt;
  </code></pre>
  
  <p>I would like to know what implies using <code>*</code> in <code>pattern="[0-9]*"</code></p>
  
  <p>Thanks!</p>