Python Regex to extract maximum numeric value from a string

Given an alphanumeric string, extract maximum numeric value from that string. Alphabets will only be in lower case.

Examples:

Input : 100klh564abc365bg
Output : 564
Maximum numeric value among 100, 564 
and 365 is 564.

Input : abchsd0sdhs
Output : 0



This problem has existing solution please refer Extract maximum numeric value from a given string | Set 1 (General approach) link. We will solve this problem quickly in python using Regex. Approach is very simple,

  1. Find list of all integer numbers in string separated by lower case characters using re.findall(expression,string) method.
  2. Convert each number in form of string into decimal number and then find max of it.
filter_none

edit
close

play_arrow

link
brightness_4
code

# Function to extract maximum numeric value from 
# a given string
import re
  
def extractMax(input):
  
     # get a list of all numbers separated by 
     # lower case characters 
     # \d+ is a regular expression which means
     # one or more digit
     # output will be like ['100','564','365']
     numbers = re.findall('\d+',input)
  
     # now we need to convert each number into integer
     # int(string) converts string into integer
     # we will map int() function onto all elements 
     # of numbers list
     numbers = map(int,numbers)
  
     print max(numbers)
  
# Driver program
if __name__ == "__main__":
    input = '100klh564abc365bg'
    extractMax(input)

chevron_right






                        filter_none








Output:


564





GeeksforGeeks has prepared a complete interview preparation course with premium videos, theory, practice problems, TA support and many more features. Please refer Placement 100 for details 



    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
Shashank Mishra
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.