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Validate IP Address using RegEx in Python

Aniruddha Chaudhari/9267/6
CodePython

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!

Python Interview Questions eBook

coding challengePythonregex
Aniruddha Chaudhari
I am complete Python Nut, love Linux and vim as an editor. I hold a Master of Computer Science from NIT Trichy. I dabble in C/C++, Java too. I keep sharing my coding knowledge and my own experience on CSEstack.org portal.

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Comments

  • Reply
    Rajat
    April 11, 2021 at 11:33 pm

    It says it’s valid – 122.134.3.0991 is a valid IP address.

    Can you test with this string – strIP = “122.134.3.0991”?

    • Reply
      Aniruddha Chaudhari
      April 17, 2021 at 10:38 am

      Thanks for identifying it. Looks like we also have to check the length of each octave.

  • Reply
    Malan
    May 31, 2021 at 10:37 pm

    Just add $ in the end.

    • Reply
      Aniruddha Chaudhari
      June 1, 2021 at 12:49 pm

      Not sure where do you want to add $. The code is working. You can try executing code on our online CSEstack IDE.

  • Reply
    Mallikarjuna
    August 7, 2021 at 2:23 pm
    out = "10.10.10.40"
    part = out.split(".")
    if len(part) > 4:
        print("invalid")
    for i in part:
        if int(i)  255:
            print("invalid")
        if not isinstance(int(i),int):
            print("invalid")
    print("valid")
    
    • Reply
      Aniruddha Chaudhari
      August 9, 2021 at 8:57 am

      This is a truly simple and easy solution. Thanks for sharing. Here problem statement is to write the regex expression to check the valid IP address.

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Why?

Why Competitive Programming Important?

Coding Challenges for Practice

  1. Count Common Factor
  2. Does it Divide
  3. Sum of Sub Arrays
  4. Pair of Desired Sum
  5. Remove Duplicate Char from String
  6. Sort String by Char Freq (Python)
  7. Sort String by Char Freq (Java)
  8. Split Array into Equal Sum Subarray
  9. Validate IP Address
  10. Validate PAN Card Number
  11. Validate Sudoku
  12. Sort Circular Rotated Array
  13. Min Arrow to Burst Bubbles
  14. Min Cost to Paint All Houses [Amazon]
  15. HourGlass with Largest Sum
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  17. Hailstone Sequence
  18. Reverse String without affecting Special Characters
  19. Secure Conversation by Encry/Decry
  20. Special Elements in Matrix
  21. Next Greater No with Same set of Digits
  22. Smallest Subarray with Sum Greater than Given Number
  23. Group Anagrams
  24. Find Duplicates in Array in O(n)
  25. Find Two Unique Numbers from Array in O(n)
  26. Number Patterns & Finding Smallest Number
  27. First Unique Element in a Stream
  28. Flip Equivalent Binary Trees [TeachMint]
  29. Minimum Cost of Merging Files [Amazon]
  30. Minimum Distance for Truck to Deliver Order [Amazon]
  31. Order Task for Given Dependencies
  32. Multilevel Parking System Design
  33. Minimum Coins Required
  34. Max Sum Subarray
  35. Max Avg Sum of Two Subsequences
  36. Merge Overlapping Intervals
  37. Longest Balanced Subarray
  38. Longest Path in a Weighted Tree
  39. Generate Balanced Parentheses
  40. PostOrder Traversal Without Recursion

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