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  1. import re
  2.  
  3. pattern = r"(# .+?\\n)"
  4. text = r"# Title\n## Chapter\n### sub-chapter#### What a lovely day.\n"
  5. header = re.search(pattern, text)
  6. print(header.group())
Success #stdin #stdout 0.02s 27712KB
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stdout
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# Title\n
https://ideone.com/b9MdBu
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
public

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