Best way to replace multiple chars in string

user_14775313 0
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I want to replace certain characters in a string like below:

Input string:

s = "1kgbutter2kilochilli30gmssalt"

Output string:

s = " 1kg butter 2kilo chilli 30gms salt"

I have tried using re.sub like below but no luck.

re.sub(r"^[0-9]*(kg|kilo|gm)s$", "*how do i add spaces if exp matches*", s)
python replace regex
1 Answers

You can use

re.sub(r'\d+(?:kg|kilo|gm)s?', r' \g<0> ', s)

NOTE: If you need to avoid the resulting spaces at the start or end of string, add .strip() at the end of the re.sub.

See the regex demo. Details:

  • \d+ - one or more digits
  • (?:kg|kilo|gm) - kg, kilo or gm
  • s? - an optional s char.

The \g<0> is a backreference that inserts the whole match back into the resulting string.

See this Python demo:

import re
s = "1kgbutter2kilochilli30gmssalt"
print( re.sub(r'\d+(?:kg|kilo|gm)s?', r' \g<0> ', s).strip() )
# => 1kg butter 2kilo chilli 30gms salt
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