title: Matching uppercase or lowercase string Regex
body: <p>I need to match the last part an an email and am using Regex.</p>
  
  <p>It is working fine using the following <code>"[a-zA-Z0-9._-]+@abc.com$"</code> but I want the last part of the address to be upper or lower case.</p>
  
  <p>so that that it will match variations such as</p>
  
  <pre><code>john@abc.co.com
  john@ABC.CO.com
  john@Abc.co.com
  </code></pre>
  
  <p>as possible scenarios...so in other words all variations of upper and lower case.</p>
  
  <p>How could I change the pattern to accommodate this</p>