if isinstance(ws.cell(1, 1).value, str) and ws.cell(1, 1).value.startswith('!!'):
            ws.cell(1, 1).value = re.sub(r" +id=('((?:[^'\\]|\\.)*)'|\"((?:[^\"\\]|\\.)*)\")", r" class=\1",
                                         ws.cell(1, 1).value)