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  1. import re
  2. text = """subject name="Biology" value="12th"
  3. topic name="system" value="anything"
  4. topic
  5. subject name="mathematics" value="12th"
  6. topic name="system" value="anything"
  7. other topics ="anything" value="anything"
  8. topic
  9. subject name="chem102" value="12th"
  10. topic name="system" value="anything"
  11. topic
  12. subject name="ComputerSc" value="12th"
  13. topic name="system" value="anything"
  14. other topics ="anything" value="anything"
  15. topic"""
  16.  
  17. l=['Biology','chem102']
  18. remove_topic = False
  19.  
  20. for line in text.splitlines():
  21. 	if line.startswith("subject"):
  22. 		name = re.search(r'\bname="([^"]*)"', line)
  23. 		if name:
  24. 			if name.group(1) in l:
  25. 				remove_topic = True
  26. 		print(line)
  27. 	elif line.strip() == "topic" and remove_topic:
  28. 		print()
  29. 		remove_topic = False
  30. 	else:
  31. 		print(line)
Success #stdin #stdout 0.02s 9592KB
comments (?)
stdin 
Standard input is empty
stdout 
subject name="Biology" value="12th"
topic name="system" value="anything"

subject name="mathematics" value="12th"
topic name="system" value="anything"
other topics ="anything" value="anything"
topic
subject name="chem102" value="12th"
topic name="system" value="anything"

subject name="ComputerSc" value="12th"
topic name="system" value="anything"
other topics ="anything" value="anything"
topic
https://ideone.com/Yknh5t
language:
Python 3 (python  3.9.5)
created:
2 years ago
visibility:
secret

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