');   assertEquals(text_get_substring($text, 'FROM_END', 0, 'FROM_END', 0), '00', 'substring #-end simple');   // The order for index for #-end is addition because this will catch errors in generators where most perform the operation ... - index.   assertEquals(text_get_substring($text, 'FROM_END', ((0 + 0) - 0), 'FROM_END', ((0 + 0) - 0)), '00', 'substring #-end 