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Python Regular Expressions in Python Introduction to Regular Expressions Word Length

regext: r"\w{count,}"

I set regex r"\w{count}", count is an integer variable, but it does't return correct result. How can I pass a variable to regex format

import re

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

def find_words(count, string):
    lst = re.findall(r"\w{count,}", string)
    return lst

1 Answer

Steven Parker
Steven Parker
221,070 Points

Python won't interpolate in a raw "r" string, for that you need an "f" string. But then you'll also need to put braces around the variable name and double the braces that you want to keep (as braces):

    lst = re.findall(f"\w{{{count},}}", string)