Home > Posts > HowTo: Extract numeric suffix from a string in Python

HowTo: Extract numeric suffix from a string in Python

I recently needed to extract a numeric suffix from a string value in Python. Initially I did the following:

import re

def extractNumSuffix(value):

    return (None if (search:=re.search(‘^\D*(\d+)$’, value, re.IGNORECASE)) is None else search.group(1))

Note that return has a single-line expression.



prints 1030

Tried it online at:



However, then I found out that Assignment Expressions in Python only work from Python 3.8 and up, so I changed it to this one:

import re

def extractNumSuffix(value):
    search=re.search(r"^\D*(\d+)$", value, re.IGNORECASE)
    return (None if search is None else search.group(1))

which should work in Python 2.x too. Don’t forget to import the regular expressions (re) module.

  1. tomi
    2021/03/12 at 02:25

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