fixed regex

        # in case of LFE 9.6 kbps NB processing strip any "-max_band XX" from cmd.extend and amend by "-max_band NB"

        if proc_chan_lfe_9k6bps_nb is True:

            cod_opts = []

            regex = re.compile(r'-max_band.*')

            cod_opts = [i for i in self.cod_opts if not regex.match(i)]

            cod_opts.append('-max_band NB')

            # search for 

            regex = re.compile(r'-max_band.*', re.I)

            last_was_max_band = False

            for i in self.cod_opts:

                # the additional arguments are expected in form of a list, where "-max_band" are "SWB" are two entries

                # then when we have detected "-max_band" in the previous run, we have to skip i again

                if last_was_max_band is True:

                    last_was_max_band = False

                    continue

                if regex.match(i):

                    last_was_max_band = True

                else:

                    cod_opts.append(i)

                    last_was_max_band = False

            cod_opts.append('-max_band')

            cod_opts.append('NB')

        else:

            cod_opts = self.cod_opts