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  1. import re
  2. text = "This is some sample text beginning with a short paragraph.\n\nThis second paragraph is long enough to be split across lines, so it contains\na single newline in the middle.\n \nThis third paragraph has an unusual separator before it; a newline followed by\na space followed by another newline. It's a special case that needs to be\nhandled."
  3. print( re.sub(r'([^\S\n]*\n(?:[^\S\n]*\n)+[^\S\n]*)|[^\S\n]*\n[^\S\n]*', lambda x: x.group(1) or ' ', text) )
Success #stdin #stdout 0.02s 9460KB
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Standard input is empty
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This is some sample text beginning with a short paragraph.

This second paragraph is long enough to be split across lines, so it contains a single newline in the middle.
 
This third paragraph has an unusual separator before it; a newline followed by a space followed by another newline. It's a special case that needs to be handled.
https://ideone.com/LRY447
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
secret

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