Identify duplicate email with . inside it
<p>How to identify duplicate emails in table with . inside in ruby on rails </p>

<p>E.x . <code>user 1: testaccount@gmail.com,</code></p>

<pre><code>  user 2: test.account@gmail.com,

  user 3: tes.t.account@gmail.com,

  user 4: test.a.ccount@gmail.com
</code></pre>

<p>Gmail refers to same email account for each emails included by '.'  .  Gmail ignores dots in email username</p>