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  1. import re
  2. s = "this is a sample\\nstring\\\\ncontaining\nall cases and one more\\n\nadded"
  3. print(re.sub(r"(?<!\\)\\n|\n", "<br>", s))
Success #stdin #stdout 0.01s 7076KB
stdin
Standard input is empty
stdout
this is a sample<br>string\\ncontaining<br>all cases and one more<br><br>added