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Python Regular Expressions in Python Introduction to Regular Expressions Word Length

Posted by Em Noble
Em Noble
6,918 Points

what else can i do?

im assuming the count variable cant go inside the curly brackets ?

word_length.py 
import re

# EXAMPLE:
# >>> find_words(4, "dog, cat, baby, balloon, me")
# ['baby', 'balloon']

def find_words(c,string):
    pattern= r'\w{c,}'
    s = re.findall(pattern,string)
    return (s)

2 Answers

Peter Vann
Peter Vann
36,427 Points

Hi Em!

You can use the count variable in the RegEx (inside the curly braces) if you cast/convert the count to a string and do some string concatenation like this:

def find_words(count, string):
    return re.findall(r'\w{' + str(count) + ',}', string)

I tested it here:

https://www.katacoda.com/courses/python/playground

Using this code:

import re

# EXAMPLE:
# >>> find_words(4, "dog, cat, baby, balloon, me")
# ['baby', 'balloon']
def find_words(count, string):
    return re.findall(r'\w{' + str(count) + ',}', string)


print( find_words(4, "dog, cat, baby, balloon, me") )

And it prints out:

['baby', 'balloon']

As expected.

I ran the code using

root@b39ef16d7dcb:/root# python3 app.py

(root@b39ef16d7dcb:/root# being just the environment prompt)

I hope that helps.

Stay safe and happy coding!

Em Noble
Em Noble
6,918 Points
Em Noble
Em Noble
6,918 Points

Yes!!

Thankyou Peter. That works.