code: def parse_rules(data, chain):
      
      rules = []
      for line in data.splitlines(True):
          m = re_rule.match(line)
          if m and m.group(3) == chain:
              rule = parse_rule(m.group(4))
              rule.packets = int(m.group(1))
              rule.bytes = int(m.group(2))
              rules.append(rule)
      return rules
docs: Parse the rules for the specified chain.