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import re
text = "keyword\n#keyword\nsome keyword\n[[keyword]] keyword"
print( re.sub(r'\b(?<!\[\[)(?<!#)keyword\b', r'[[\g<0>]]', text) )

Success #stdin #stdout 0.02s 9664KB

stdin

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Standard input is empty

stdout

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[[keyword]]
#keyword
some [[keyword]]
[[keyword]] [[keyword]]

https://ideone.com/90OKy2

language:

Python 3 (python 3.9.5)

created:

visibility:

secret

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