A Regex Example

CHAPTER 1 CHAPTER................................................................................................................................ 5
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CHAPTER 2 CHAPTER ......................................................................................11
2.1. SUBTITLE.................................................................................................................... 11
2.2. SUBTITLE........................................................................................................................... 11
2.3. SUBTITLE...................................................................................................................... 13
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2.5. SUBTITLE..................................................................................................................................... 17
2.6. SUBTITLE...................................................................................................... 17
CHAPTER 3 CHAPTER........................................................................................... 21
3.1. SUBTITLE............................................................................................................................................ 22
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3.11. SUBTITLE...................................................................................................................... 158
3.12. SUBTITLE............................................................................................... 169
CHAPTER 4 CHAPTER.............................................................................182
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4.2. SUBTITLE .................................................................................................................................. 189
4.3. SUBTITLE...................................................................................................................................... 200
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CHAPTER 5 CHAPTER........................................................................................................................................ 225
5.1. SUBTITLE................................................................................................................................... 226
5.2. SUBTITLE......................................................................................................... 229
5.3. SUBTITLE.................................................................................................................................. 231
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5.5. SUBTITLE........................................................................................................................................... 243
5.6. SUBTITLE............................................................245