code: public static int getLastIndexOfIgnoreCase (@Nullable final String sText,
                                                final char cSearch,
                                                @Nonnull final Locale aSortLocale)
    {
      return sText != null && sText.length () >= 1
                                                   ? sText.toLowerCase (aSortLocale)
                                                          .lastIndexOf (Character.toLowerCase (cSearch))
                                                   : STRING_NOT_FOUND;
    }
docs: Get the last index of cSearch within sText ignoring case.
  
  @param sText
  The text to search in. May be <code>null</code>.
  @param cSearch
  The char to search for. May be <code>null</code>.
  @param aSortLocale
  The locale to be used for case unifying.
  @return The last index of sSearch within sText or {@value #STRING_NOT_FOUND}
  if sSearch was not found or if any parameter was <code>null</code>.
  @see String#lastIndexOf(int)