title: Validate nickname with regex
body: <p>I neet to validate a nick name without <code>@</code> and <code>#</code>and  it can't start with numbers</p>
  
  <p>thi is my solution but the <code>@</code> and <code>#</code></p>
  
  <pre><code>(^[^0-9])([\w a-z A-Z 0-9][^@#])
  </code></pre>
  
  <p>.test:</p>
  
  <pre><code>andrea //true
  0andrea // false
  
  // these are true but I need them to be false
  
  and@rea // true
  and#rea // true
  </code></pre>