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.

So

print(extractNumSuffix("test1030"))

prints 1030

Tried it online at:

https://repl.it/languages/python3

extractNumSuffix

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. No comments yet.
  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: