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Asked: 2026-06-10T04:07:44+00:00

The following Python script: re.sub([^a-zA-Z]pi[^a-zA-Z], (math.pi), 2pi3 + supirse) results in: ‘(math.pi) + supirse’

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The following Python script: re.sub("[^a-zA-Z]pi[^a-zA-Z]", "(math.pi)", "2pi3 + supirse")

results in: '(math.pi) + supirse'

While the match of a non-alpha before and after pi is critical, I do not want these non-alpha characters to be replaced in the match. I would like to see the following output: '2(math.pi)3 + supirse'

Note: A previous suggestion of the following: re.sub("\Bpi\B", "(math.pi)", "2pi3 + supirse")

results in a complete replacement of every instance: '2(math.pi)3 + su(math.pi)rse' which is also NOT what I am looking for

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1 Answer

  1. Editorial Team

    Use this instead: re.sub("(?<=[^a-zA-Z])pi(?=[^a-zA-Z])", "(math.pi)", "2pi3 + supirse")

    Visualization: http://regex101.com/r/fX5wX3

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