Strip tags from pathauto node title

gistfile1.php

function custom_tokens_alter(array &$replacements, array $context) {
  $options = $context['options'];
  $sanitize = !empty($options['sanitize']);

  if ($context['type'] == 'node' && !empty($context['data']['node'])) {
    $node = $context['data']['node'];
    foreach ($context['tokens'] as $name => $original) {
      switch ($name) {
        case 'title':
          $title = !empty($options['pathauto']) ? strip_tags($node->title) : $node->title;
          $replacements[$original] = $sanitize ? check_plain($title) : $title;
          break;
      }
    }
  }
}