class_docstr: Matches lines from the output based on regular expressions:
  
  :param regexp: regular expression matching lines that should be displayed
  :param regexp_for_joined_line: optional regular expression for lines that might be shown together with the
         following matching lines. Useful, when progress status is only visible in previous line, for
         example when you have test output like that, you want to show both lines:
  
             test1 ....... [ 50%]
             test2 ...
class_docstr_tok: ["Matches","lines","from","the","output","based","on","regular","expressions",":",":","param","regexp",":","regular","expression","matching","lines","that","should","be","displayed",":","param","regexp_for_joined_line",":","optional","regular","expression","for","lines","that","might","be","shown","together","with","the","following","matching","lines",".","Useful",",","when","progress","status","is","only","visible","in","previous","line",",","for","example","when","you","have","test","output","like","that",",","you","want","to","show","both","lines",":","test1",".......","[","50","%","]","test2","..."]
code: def get_best_matching_lines(self, output: Output) -> list[str] | None:
      last_lines, last_lines_no_colors = get_last_lines_of_file(
          output.file_name, num_lines=self.lines_to_search
      )
      best_line: str | None = None
      previous_line: str | None = None
      for index, line in enumerate(last_lines_no_colors):
          match = self.matcher.match(line)
          if match:
              best_line = last_lines[index]
              if self.matcher_for_joined_line is not None and index > 0:
                  if self.matcher_for_joined_line.match(
                      last_lines_no_colors[index - 1]
                  ):
                      previous_line = last_lines[index - 1].strip()
      if best_line is not None:
          if (
              self.matcher_for_joined_line is not None
              and previous_line is not None
          ):
              list_to_return: list[str] = [previous_line, best_line]
              return list_to_return
          else:
              self.last_good_match[output.file_name] = best_line
      last_match = self.last_good_match.get(output.file_name)
      if last_match is None:
          return None
      return [last_match]
  
imports: from __future__ import annotations
  import datetime
  import os
  import re
  import sys
  import textwrap
  import time
  from abc import ABCMeta, abstractmethod
  from contextlib import contextmanager
  from enum import Enum
  from multiprocessing.pool import ApplyResult, Pool
  from pathlib import Path
  from tempfile import NamedTemporaryFile
  from threading import Thread
  from typing import Any, Generator, NamedTuple
  from rich.table import Table
  from airflow_breeze.utils.console import MessageType, Output, get_console
  from airflow_breeze.utils.shared_options import get_dry_run, get_forced_answer, get_verbose, set_dry_run, set_forced_answer, set_verbose
label_desc: Use image node_id 2 for calling the GenericRegexpProgressMatcher obj's underlying member method code with example usage: obj.get_best_matching_lines(output) and returns: list, None, list_to_return