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I want to replace part of a string based on re.sub method as below

import re
re.sub("([0-9]_F)$", '[0-9]_DO', 'sdsd3_F')

However I fail to manage the numerical part of match which is also a variable. Basically I want to replace 3_F with 3_DO where the number can be any number.

Could you please help with right approach?

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1 Answer 1

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Use backreferences:

re.sub(r'(\d)_F$', r'\1_DO', data)

Parentheses capture part of the match, which can be referred to in the replacement using \1, \2, etc. \d means a digit.

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4 Comments

Thanks. But it is not F with DO
> Basically I want to replace 3_D with 3_DO where the number can be any number.
Actually it was a typo. I have corrected my original post
Ok, adjusted my answer for the same.

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