Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Regular Expressions in Python Introduction to Regular Expressions Negated Numbers

Posted by Utkarsh Mittal
Utkarsh Mittal
3,105 Points

negation

Create a variable named good_numbers that is an re.findall() where the pattern matches anything in string except the numbers 5, 6, and 7

negate.py 
import re

string = '1234567890'
good_numbers=re.findall(r"[\d]+[^567]",string)

1 Answer

Ryan S
Ryan S
27,276 Points
Ryan S
Ryan S
27,276 Points

Hi Utkarsh,

The challenge asks you to match anything in the string except 5, 6, and 7. So all you need to do is keep the negation part. 

import re

string = '1234567890'
good_numbers = re.findall(r'[^567]', string)