Swearing Module

and reassurance.

Now, here's my first module (I hope no-one is offended by my example):

function swearingfilter_help($section) {
  switch ($section) {
    case 'admin/modules#description':
      return t('Filter out swearing.');
  }
}

function swearingfilter_filter_tips($delta, $format, $long = false) {
  if ($long) {
    return t('This filter will completely remove all swearing from comments, so it is better not to use them in the first place.');
  }
  else {
    return t('Swear words will be deleted.');
  }
}

function swearingfilter_censored($text) {
    $text = ' ' . $text . ' ';
    $swearing = 'bitch|shit';
    $swearing = explode('|',$swearing); 
    foreach ($swearing as $swearword) 
        $text = preg_replace('/([^A-Za-z])'.$swearword.'([^A-Za-z])/si','\\1' . '****' . '\\2',$text);    
    $text = substr($text,1);
    $text = substr($text, 0, -1);
    return $text;
}

function swearingfilter_filter($op, $delta = 0, $format = -1, $text = '') {
  switch ($op) {
    case 'list':
      return array(0 => t('Swearing filter'));
    case 'description':
      return swearingfilter_help('admin/modules#description');
    case 'process':
      $text = swearingfilter_censored($text);
      return $text;
    default:
      return $text;
  }
}

Issues I can think of: how to add/delete/edit terms without changing the module file - should I use MySQL table?