public boolean isPalindrome()
{
   int start = 0;
   int end = text.length() - 1;
   while (start < end)
   {
      char first = Character.toLowerCase(text.charAt(start));
      char last = Character.toLowerCase(text.charAt(end);
      if (Character.isLetter(first) && Character.isLetter(last))
      {
         // Both are letters.
         if (first == last)
         {
            start++;
            end--;
         }
         else
            return false;
      }
      if (!Character.isLetter(last))
         end--;
      if (!Character.isLetter(first))
         start++;
   }
   return true;
}