title: Remove bad character if at beginning of column
body: <p>I have a <code>DF</code> of emails where the first character in the email is occasionally a symbol. I am trying to remove it if it exists.</p>
  <pre class="lang-text prettyprint-override"><code>+--------------------+
  |       Email        |
  +--------------------+
  |bob@gmail.com       |
  |*steve@yahoo.com    |
  |leeroy@hotmail.com  |
  |@grant@gmail.com    |
  +--------------------+
  </code></pre>
  <p>The final <code>df</code> would look like this:</p>
  <pre class="lang-text prettyprint-override"><code>+--------------------+
  |       Email        |
  +--------------------+
  |bob@gmail.com       |
  |steve@yahoo.com     |
  |leeroy@hotmail.com  |
  |grant@gmail.com     |
  +--------------------+
  </code></pre>
  <p>Is there a way to do this efficiently?</p>