code: @Unstable
      public static String toAlphaNumeric(String text)
      {
          if (isEmpty(text)) {
              return text;
          }
  
          return stripAccents(text).replaceAll("[^a-zA-Z0-9]", "");
      }
docs: Removes all non alpha numerical characters from the passed text. First tries to convert diacritics to their
  alpha numeric representation.
  
  @param text the text to convert
  @return the alpha numeric equivalent
  @since 10.6RC1