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Regular Expression to Validate PAN Card Number in Python

Aniruddha Chaudhari/2721/0
CodePython
YouTube CSEstack

Problem Statement: Write a regular expression to validate PAN card number in Python programming.

M Stark works in the sales department. He has a paragraph P of words that contain some PAN card numbers.

He wants to count the number of distinct valid PAN card numbers in P.

A valid PAN card number is a 10 lenght alphanumeric word of the form “AAAAA1111A” (without quotes) where

  • A denotes any letter of English uppercase alphabets.
  • 1 denotes any digit in 0, 1, 2, 3,..., 9
  • The fourth character can be only from the set {'A','B','C','F','G','H','L','J','P','T','K'}
  • The fifth character must be the same as the first character.

Example

MKOFM5336A is a valid PAN card number.

As checking manually will take a lot of time, so write a script for this task.

This challenge was asked in Bright Money online coding test.

Algorithm

  • Write a regular expression (RegEx) for the PAN card matching pattern based on the rules mentioned in the problem.
    (Writing correct Python RegEx is an important and deciding factor for solving this problem.)
  • Use findall() method from re module to get the list of all the valid PAN numbers.
  • There can be some duplicate PAN card numbers, so use set() method to remove all duplicates PAN card numbers.

Python RegEx to find valid PAN Card Numbers

Let’s use the findall() method from re module.

Code

import re

def get_valid_pan_number(par):
    re_exp = r"[A-Z]{3}[ABCFGHLJPTK]{1}[A-Z]{1}[0-9]{4}[A-Z]{1}"
    return re.findall(re_exp, par)

par = "AABZA1111A AABAA1111AxMKOFM5336A"
print(set(get_valid_pan_number(par)))

Output

{'MKOFM5336A', 'AABAA1111A'}

Sometimes you may asked to count the valid PAN card numbers.

Python RegEx Count Valid PAN card numbers

You have use len() method to calculate the number of valid PAN card numbers.

Code

import re

def get_valid_pan_number(par):
    re_exp = r"[A-Z]{3}[ABCFGHLJPTK]{1}[A-Z]{1}[0-9]{4}[A-Z]{1}"
    return re.findall(re_exp, par)

par = "AABZA1111A AABAA1111AxMKOFM5336A"
print(len(set(get_valid_pan_number(par))))

Output

2

Similar Problem on Regular Expression

  • Write Regular Expression to Validate IP Address in Python
    (asked in Juniper coding interview)

Writing regular expression makes your job very easy for pattern matching. If you want to solve this kind of problems manually (without using RegEx module), it will be complex and cumbersome.

You can use any other programming languages of your choice to solve this problem.

This is all about programming regular expression to validate PAN card number in Python. Do you find it useful? 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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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. Sort Circular Rotated Array
  12. Min Arrow to Burst Bubbles
  13. HourGlass with Largest Sum
  14. Max Profit by Buying/Selling Stocks
  15. Hailstone Sequence
  16. Reverse String without affecting Special Characters
  17. Secure Conversation by Encry/Decry
  18. Special Elements in Matrix
  19. Next Greater No with Same set of Digits
  20. Smallest Subarray with Sum Greater than Given Number
  21. Group Anagrams
  22. Find Duplicates in Array in O(n)
  23. Find Two Unique Numbers from Array in O(n)
  24. Number Patterns & Finding Smallest Number
  25. Minimum Cost of Merging Files [Amazon]
  26. Minimum Distance for Truck to Deliver Order [Amazon]
  27. Minimum Coins Required
  28. Max Sum Subarray
  29. Merge Overlapping Intervals
  30. Longest Balanced Subarray
  31. Longest Path in a Weighted Tree
  32. Generate Balanced Parentheses
  33. PostOrder Traversal Without Recursion

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