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  1. import re
  2.  
  3. s = '<p id="1">'
  4. print(re.sub(r'<p(?=\s+id="\d+">)', r'<p class="test"', s))
Success #stdin #stdout 0.02s 9500KB
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Standard input is empty
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<p class="test" id="1">
https://ideone.com/LLl4A2
language:
Python 3 (python  3.12)
created:
4 years ago
visibility:
public

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