code: def _parse_meta_info(self, line):
          
          if self.mslevel:
              self.meta_info['ms_level'] = self.mslevel
  
          if self.polarity:
              self.meta_info['polarity'] = self.polarity
  
          for k, regexes in six.iteritems(self.meta_regex):
              for reg in regexes:
  
                  m = re.search(reg, line, re.IGNORECASE)
  
                  if m:
                      self.meta_info[k] = m.group(1).strip()
docs: Parse and extract all meta data by looping through the dictionary of meta_info regexs
  
          updates self.meta_info
  
          Args:
               line (str): line of the msp file