Count the occurrence of some text in a string in polars

count_matches

You have a table of passwords and, for some reason, you want to count the number of digits in each password. This is possible using Polars. Below is a dataframe of passwords.

shape: (3, 1)

Password
str
"marm1te"
"jam543"
"p3anutButt3r"

Count number of digits in each password

You can count the number of digits in each password using the function count_matches like this:

(df
 .with_columns(pl.col('Password').str.count_matches(r'\d')
               .alias('Num_of_Digits'))
 )

shape: (3, 2)

Password	Num_of_Digits
str	u32
"marm1te"	1
"jam543"	3
"p3anutButt3r"	2

Discover even more ways to use Polars in my Polars course.