title: What is the mask for emails using swing's MaskFormatter
body: <p>Using Java swing, what is the string that correspond to a correct email mask when using the <a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/MaskFormatter.html" rel="nofollow noreferrer"><code>MaskFormatter</code></a>?
  Is that possible at all to actually use a <code>MaskFormatter</code> for emails?</p>