title: Regular expression for EDU emails with sub domains
body: <p>I am attempting to create a regular expression for validating edu emails which may or may not have a sub domain. Some schools have emails like &quot;example@hms.harvard.edu&quot; while other schools have emails like &quot;example@stanford.edu&quot;.</p>
  <pre><code>([0-9]|[a-z]|[A-Z])+@([0-9]|[a-z]|[A-Z])+([0-9]|[a-z]|[A-Z])\.edu$&quot;
  </code></pre>
  <p>This is the current regular expression that I have but I am not well versed in these.
  I am looking to create an expression that will validate emails with one domain and emails with a subdomain.</p>
  <p>Any help would be appreciated. Thanks!</p>