title: PHP regular expression limit reached (pcre.backtrack_limit)
body: <p>I am facing the following error:</p>
  
  <blockquote>
    <p><strong>PHP regular expression limit reached (pcre.backtrack_limit)</strong></p>
    
    <p>You may not be able to visit this page because of:</p>
    
    <ul>
    <li>an out-of-date bookmark/favourite</li>
    <li>a search engine that has an out-of-date listing for this site</li>
    <li>a mistyped address</li>
    <li>you have no access to this page</li>
    <li>The requested resource was not found.</li>
    <li>An error has occurred while processing your request.</li>
    </ul>
  </blockquote>
  
  <p>I have also tried to add the following code in <code>configuration.php</code> and <code>index.php</code>:</p>
  
  <pre><code>ini_set('pcre.backtrack_limit',1000000); 
  ini_set('pcre.recursion_limit',1000000);
  </code></pre>
  
  <p>Unfortunately it has not worked.  What is happening here and what can be done to address it?</p>