Question

How to extract the number from the end of a string in Python

Answer 1

def extract_the_number_from_end_of_string(s):
    num = 0
    i = len(s) - 1
     
    # Traverse the string from the end to extract the number
    while i >= 0 and s[i].isdigit():
        num = num + int(s[i]) * (10 ** (len(s) - 1 - i))
        i -= 1
     
    return num
 
 
s = "python java c c++ 194"
 
print(extract_the_number_from_end_of_string(s)) 


 
'''
run:
 
194
 
'''

 

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Answer 2

import re

def extract_the_number_from_end_of_string(s):
    return re.search(r"(\d+)$", s).group()
 
 
s = "python java c c++ 194"
 
print(extract_the_number_from_end_of_string(s)) 


 
'''
run:
 
194
 
'''

 

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Answer 3

def extract_the_number_from_end_of_string(s):
    return ''.join([char for char in s[::-1] if char.isdigit()])[::-1]
 
 
s = "python java c c++ 194"
 
print(extract_the_number_from_end_of_string(s)) 


 
'''
run:
 
194
 
'''

 

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Answer 4

def extract_the_number_from_end_of_string(s):
    return ''.join(filter(str.isdigit, s[::-1]))[::-1]
 
 
s = "python java c c++ 194"
 
print(extract_the_number_from_end_of_string(s)) 


 
'''
run:
 
194
 
'''

 

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