title: CodeIgniter 2 Disallowed Key Characters
body: <p>In <code>system\core\Input.php</code>.</p>
  
  <pre><code>if(!preg_match('/^[~a-zA-Z0-9{},:_\/-]+$/i', $str))
  {
  
      exit('Disallowed Key Characters: '.$str);
  }
  </code></pre>
  
  <p>This triggers Disallowed Key Characters: when <code>$str</code> contains:</p>
  
  <pre><code>{"education_level":"1","job_experience":"1","occupation":"41-3011","onet_code"
  :"41-3011_00","region":"22220","relevance":"0","school":"0","schoolstate":"0","state":"4","gpa":"0","major"
  :"0"}
  </code></pre>