CODEWITHSUNDEEP
pythonregex
Maiko Ohkawa
Maiko Ohkawa

Reputation: 933

Can I insert comma into numbers? The numbers are parts of strings

I want to do like this. Do you know a good way?

import re

if __name__ == '__main__':
    sample = "eventA 12:30 - 14:00 5200yen / eventB 15:30 - 17:00 10200yen enjoy!"
    i_want_to_generate = "eventA 12:30 - 14:00 5,200yen / eventB 15:30 - 17:00 10,200yen enjoy!"

    replaced = re.sub("(\d{1,3})(\d{3})", "$1,$2", sample)  # Wrong.
    print(replaced)  # eventA 12:30 - 14:00 $1,$2yen / eventB 15:30 - 17:00 $1,$2yen enjoy!

Upvotes: 1

Views: 83

Answers (2)

Viktor Jacynycz
Viktor Jacynycz

Reputation: 86

Use \1 instead of $1 for substitution

Check: https://regex101.com/r/T2sbD2/1

Upvotes: 1

Moses Koledoye
Moses Koledoye

Reputation: 78564

You're not using the correct notation for your back-reference(s). You could also add a positive lookahead assertion containing the currency to ensure only those after the 'yen' are changed:

replaced = re.sub(r"(\d{1,3})(\d{3})(?=yen)", r"\1,\2", sample)  # Wrong.
print(replaced) 

# eventA 12:30 - 14:00 5,200yen / eventB 15:30 - 17:00 10,200yen enjoy!

Upvotes: 5

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