# Python | Frequency of numbers in String

• Last Updated : 22 Apr, 2020

Sometimes, while working with Strings, we can have a problem in which we need to check how many of numerics are present in strings. This is a common problem and have application across many domains like day-day programming and data science. Lets discuss certain ways in which this task can be performed.

Method #1 : Using `re.findall() + len()`
The combination of above functions can be used to perform this task. In this, we check for all numbers and put in list using findall() and the count is extracted using len().

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning - Basic Level Course

 `# Python3 code to demonstrate working of ``# Frequency of numbers in String``# Using re.findall() + len()``import` `re`` ` `# initializing string``test_str ``=` `"geeks4feeks is No. 1 4 geeks"`` ` `# printing original string``print``(``"The original string is : "` `+` `test_str)`` ` `# Frequency of numbers in String``# Using re.findall() + len()``res ``=` `len``(re.findall(r``'\d+'``, test_str))`` ` `# printing result ``print``(``"Count of numerics in string : "` `+` `str``(res)) `
Output :

```The original string is : geeks4feeks is No. 1 4 geeks
Count of numerics in string : 3
```

Method #2 : Using `sum() + findall()`
The combination of above functions can also be used to solve this problem. In this, we cumulate the sum using sum(). The task of findall() is to find all the numerics.

 `# Python3 code to demonstrate working of ``# Frequency of numbers in String``# Using re.findall() + sum()``import` `re`` ` `# initializing string``test_str ``=` `"geeks4feeks is No. 1 4 geeks"`` ` `# printing original string``print``(``"The original string is : "` `+` `test_str)`` ` `# Frequency of numbers in String``# Using re.findall() + sum()``res ``=` `sum``(``1` `for` `_ ``in` `re.finditer(r``'\d+'``, test_str)) `` ` `# printing result ``print``(``"Count of numerics in string : "` `+` `str``(res)) `
Output :
```The original string is : geeks4feeks is No. 1 4 geeks
Count of numerics in string : 3
```

My Personal Notes arrow_drop_up