title: customize bootstrap email form field validation
body: <p>I use a bootstrap form email field validation on frontend</p>
  
  <pre><code>form.validate({
    rules: {
      emails: {
        emails: true
        }
      }
    })
  </code></pre>
  
  <p>And an <code>EmailField</code> on backend using <code>Django</code>. I've found a regexp bug in bootstrap validation:</p>
  
  <ul>
  <li>typing email@name.d does validate email</li>
  <li>on the backend <code>Django</code> says the email is wrong</li>
  </ul>
  
  <p>Question is: How to apply custom form email validation using bootstrap? All I need is to set my own regexp. I could get rid of bootstrap validation tho, but there are some useful styling on <code>success</code> and <code>error</code> which I don't really want rewrite</p>