title: Percent Symbol in CodeIgniter URI
body: <p>I need to pass an encoded string to a CodeIgniter controller.</p>
  
  <p><strong>Example</strong>:</p>
  
  <pre><code>DOSOMETHING/Coldplay/Fix+You/273/X+%26+Y/
  </code></pre>
  
  <p>My problem is the percent symbol that is a disallowed character. I've tried to change the config file with the following:</p>
  
  <pre><code>$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-\+\%';
  </code></pre>
  
  <p>The <code>+</code> is ok, but the <code>%</code> is not valid. Can you help me to change this reg exp so it will allow the <code>%</code> symbol? Thanks in advance!</p>