scary piece of python

gistfile1.py

    def limits(base=None, row=None):
        if base:
            row = base.find('table', {'class': 'CLPTable'})\
                      .find('tr', {'class': 'results-row'})

            regex = ur"(.+); (H[0-9]+): (C (≥|>) ([0-9,]+)%|([0-9,]+)% (≤|&lt;|<) C (≤|&lt;|<) ([0-9,]+)%)([ *]*)"
        else:
            regex = ur"(.+)(): (C (≥|>) ([0-9,]+)%|([0-9,]+)% (≤|&lt;|<) C (≤|&lt;|<) ([0-9,]+)%)([ *]*)"

        raw = row.find_all('td', {'rowspan': re.compile('[0-9]+')})[2]\
                 .findAll(text=True)

        parsed = [{'category': m.group(1),
                   'code': m.group(2),
                   'low_eq': m.group(5) if m.group(4) and m.group(4) == u'≥' else m.group(6) if m.group(7) and m.group(7) == u'≤' else u'',
                   'low': m.group(5) if m.group(4) and m.group(4) == u'>' else m.group(6) if m.group(7) and m.group(7) != u'≤' else u'',
                   'high_eq': m.group(9) if m.group(9) and m.group(8) == u'≤' else u'',
                   'high': m.group(9) if m.group(9) and m.group(8) != u'≤' else u'',
                   'remark': m.group(10).strip()}
                if m != None else {'special': s}
                for (m, s) in
                 ((re.match(regex,
                            limit.strip()),
                   limit.strip())
                  for limit in raw
                  if len(limit.strip()) > 0)]

        return {'raw': [l.strip() for l in raw if len(l.strip()) > 0],
                'parsed': parsed}