docs: def parse(line):
      """
      Parses a log line using the regexices above.
      :param line: A log line to be parsed.
      :return: If no match is found, None, otherwise a dict containing the values parsed from the log line.
      """
      values = None
      matches = re.search(regex, line)
      if matches:
  
          # Standard values
          values = {
              'date_time': matches.group(DATE_TIME),
              'log_level': matches.group(LOG_LEVEL),
              'process_id': matches.group(PROCESS_ID),
              'thread_name': matches.group(THREAD_NAME),
              'logger_name': matches.group(LOGGER_NAME),
              'log_message': matches.group(LOG_MESSAGE)
          }
  
          # Optional transaction tracking information
          if matches.group(TRANSACTION):
              values["transaction"] = {
                  "app": matches.group(TRANSACTION_APP),
                  "id": matches.group(TRANSACTION_ID),
                  "span": matches.group(TRANSACTION_SPAN),
                  "exported": matches.group(TRANSACTION_EXPORTED)
              }
  
      return values