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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def compile_regex_from_str(self, ft_str):
 """Given a string describing features masks for a sequence of segments, return a regex matching the corresponding strings. Args: ft_str (str):
 feature masks, each enclosed in square brackets, in which the features are delimited by any standard delimiter. Returns: Pattern: regular expression pattern equivalent to `ft_str` """


        sequence = []
        for m in re.finditer(r'\[([^]]+)\]', ft_str):
            ft_mask = fts(m.group(1))
            segs = self.all_segs_matching_fts(ft_mask)
            sub_pat = '({})'.format('|'.join(segs))
            sequence.append(sub_pat)
        pattern = ''.join(sequence)
        regex = re.compile(pattern)
        return regex