不用正则，直接split判断就行

s = '''PERFORMER "Various"
TITLE "宝丽金非常老牌精选"
FILE "CDImage.ape" WAVE
  TRACK 01 AUDIO
    TITLE "太阳一样"
    PERFORMER "刘文正"
    INDEX 01 00:00:00
  TRACK 02 AUDIO
    TITLE "堆积情感"
    PERFORMER "邝美云"
    INDEX 00 03:28:07
    INDEX 01 03:30:10
  TRACK 03 AUDIO
    TITLE "时空寄情"
    PERFORMER "黄莺莺"
    INDEX 00 08:24:00
    INDEX 01 08:27:12
  TRACK 04 AUDIO
    TITLE "再见我的爱人"
    PERFORMER "邓丽君"
    INDEX 00 12:33:10
    INDEX 01 12:36:32
  TRACK 05 AUDIO
    TITLE "海角天涯"
    PERFORMER "王芷蕾"
    INDEX 00 16:03:02
    INDEX 01 16:06:07
  TRACK 06 AUDIO
    TITLE "廻"
    PERFORMER "李恕权"
    INDEX 00 19:30:30
    INDEX 01 19:33:22
  TRACK 07 AUDIO
    TITLE "故事的真相"
    PERFORMER "黄仲昆、杨林"
    INDEX 00 24:04:05
    INDEX 01 24:06:12
  TRACK 08 AUDIO
    TITLE "扬帆"
    PERFORMER "阳帆"
    INDEX 00 28:34:42
    INDEX 01 28:37:22'''

tracks = [line.split(' ')[-1][1:-1] for line in s.split('\n') if line.startswith('    TITLE')]
print(tracks)


结果:
=================== RESTART: D:\Personal\Code\Python\Test.py ===================
['太阳一样', '堆积情感', '时空寄情', '再见我的爱人', '海角天涯', '廻', '故事的真相', '扬帆']
※ 修改:·one4all4one 于 Apr  4 21:03:44 2020 修改本文·[FROM: 82.19.154.*]
※ 来源:·水木社区 http://m.newsmth.net·[FROM: 82.19.154.*]

修改:one4all4one FROM 82.19.154.*
FROM 82.19.154.*