title: a regex to prevent an text input be an email address in laravel validation php
body: <p>I need a regex for laravel validation to control my username input not be an email address
  any help plz?</p>
  <p><code>&lt;input type=&quot;text&quot; placeholder=&quot;Don't type email address for your usename&quot; name=&quot;username&quot;&gt;&lt;/input&gt;</code></p>
  <p>my Laravel validation for username input</p>
  <p><code>'username' =&gt; 'required|min:5|regex:?'</code></p>