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  1. import re
  2.  
  3. pattern = r"^(\$\$[\s\S]*?\$\$)$|(?<!\$)\$(\$[\s\S]*?\$)\$(?!\$)"
  4. test_str = ("$$ stand alone $$\n\n"
  5.             "$$ stand \n"
  6.             "alone $$\n\n"
  7.             "And there $$ inline $$. ")
  8.  
  9. regex = re.compile(pattern, re.MULTILINE)
  10. result = re.sub(
  11.     regex,
  12.     lambda x: x.group(2) if x.group(2) else x.group(1), test_str
  13. )
  14.  
  15. if result:
  16.     print (result)
Success #stdin #stdout 0.02s 9536KB
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Standard input is empty
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$$ stand alone $$

$$ stand 
alone $$

And there $ inline $.
https://ideone.com/r0X4J2
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
secret

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