Validate IP Address using RegEx in Python

Problem Statement: Write a Python program to validate if the given string is a valid IP address or not.

This is one of the questions asked in Juniper coding interview.

In Computer Network, the IP address uniquely defines each host or node in the network. You can read mode about IP address in Computer Networking.

Basically, this is a pattern matching problem where we can use a regular expression (RegEx).

IP Address Validation using Python RegEx

Here we are using the search method from the re module. You can find more detail in the Python RegEx tutorial.

Code

import re 
 
regexIP = '''^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
    25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
    25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
    25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)'''
 
def validateIP(strIP): 
 
    if(re.search(regexIP, strIP)):
        print(f"{strIP} is a valid IP address.") 
     
    else: 
        print(f"{strIP} is an invalid IP address.") 
 
 
if __name__ == '__main__' : 
     
    strIP = "122.134.3.123"
    validateIP(strIP) 
 
    strIP = "44.235.34.1"
    validateIP(strIP) 
 
    strIP = "277.13.23.17"
    validateIP(strIP) 

Output

122.134.3.123 is a valid IP address. 
44.235.34.1 is a valid IP address.
277.13.23.17 is an invalid IP address.

Note: When we say IP address, by default its IPv4 address which is different from IPv6 address.

This is a simple program to validate IP address using regex in Python. Do you have any other solutions? Let me know in the comment. Thanks!