code: def parse(self):
          
  
          result = ['']
          negative = False
  
          p = util.norm_pattern(self.pattern, not self.unix, self.raw_chars)
  
          p = p.decode('latin-1') if self.is_bytes else p
          if is_negative(p, self.flags):
              negative = True
              p = p[1:]
  
          self.root(p, result)
  
          case_flag = 'i' if not self.case_sensitive else ''
          if util.PY36:
              pattern = (
                  r'^(?!(?s%s:%s)$).*?$' if negative and not self.globstar_capture else r'^(?s%s:%s)$'
              ) % (case_flag, ''.join(result))
          else:
              pattern = (
                  r'(?s%s)^(?!(?:%s)$).*?$' if negative and not self.globstar_capture else r'(?s%s)^(?:%s)$'
              ) % (case_flag, ''.join(result))
  
          if self.is_bytes:
              pattern = pattern.encode('latin-1')
  
          return pattern
docs: Parse pattern list.