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How to validate PAN Card number using Regular Expression

  • Difficulty Level : Hard
  • Last Updated : 27 Jan, 2021

Given string str of alphanumeric characters, the task is to check whether the string is a valid PAN (Permanent Account Number) Card number or not by using Regular Expression.
The valid PAN Card number must satisfy the following conditions: 

  1. It should be ten characters long.
  2. The first five characters should be any upper case alphabets.
  3. The next four-characters should be any number from 0 to 9.
  4. The last(tenth) character should be any upper case alphabet.
  5. It should not contain any white spaces.

Examples:

Input: str = “BNZAA2318J” 
Output: true 
Explanation: 
The given string satisfies all the above mentioned conditions.

Input: str = “23ZAABN18J” 
Output: false 
Explanation: 
The given string not starts with upper case alphabets, therefore it is not a valid PAN Card number.

Input: str = “BNZAA2318JM” 
Output: false 
Explanation: 
The given string contains eleven characters, therefore it is not a valid PAN Card number.



Input: str = “BNZAA23184” 
Output: true 
Explanation: 
The last(tenth) character of this string is a numeric(0-9) character, therefore it is not a valid PAN Card number. 

Input: str = “BNZAA 23184” 
Output: true 
Explanation: 
The given string contains white spaces, therefore it is not a valid PAN Card number. 

Approach: This problem can be solved by using Regular Expression. 

  • Get the string.
  • Create a regular expression to validate the PAN Card number as mentioned below:
regex = "[A-Z]{5}[0-9]{4}[A-Z]{1}";
  • Where: 
    • [A-Z]{5} represents the first five upper case alphabets which can be A to Z.
    • [0-9]{4} represents the four numbers which can be 0-9.
    • [A-Z]{1} represents the one upper case alphabet which can be A to Z.
  • Match the given string with the regex, in Java, this can be done using Pattern.matcher().
  • Return true if the string matches with the given regex, else return false.

Below is the implementation of the above approach: 

Java




// Java program to validate the
// PAN Card number using Regular Expression
 
import java.util.regex.*;
 
class GFG
{
 
    // Function to validate the PAN Card number.
    public static boolean isValidPanCardNo(String panCardNo)
    {
 
        // Regex to check valid PAN Card number.
        String regex = "[A-Z]{5}[0-9]{4}[A-Z]{1}";
 
        // Compile the ReGex
        Pattern p = Pattern.compile(regex);
 
        // If the PAN Card number
        // is empty return false
        if (panCardNo == null)
        {
            return false;
        }
 
        // Pattern class contains matcher() method
        // to find matching between given
        // PAN Card number using regular expression.
        Matcher m = p.matcher(panCardNo);
 
        // Return if the PAN Card number
        // matched the ReGex
        return m.matches();
    }
 
    // Driver Code.
    public static void main(String args[])
    {
 
        // Test Case 1:
        String str1 = "BNZAA2318J";
        System.out.println(isValidPanCardNo(str1));
 
        // Test Case 2:
        String str2 = "23ZAABN18J";
        System.out.println(isValidPanCardNo(str2));
 
        // Test Case 3:
        String str3 = "BNZAA2318JM";
        System.out.println(isValidPanCardNo(str3));
 
        // Test Case 4:
        String str4 = "BNZAA23184";
        System.out.println(isValidPanCardNo(str4));
 
        // Test Case 5:
        String str5 = "BNZAA 23184";
        System.out.println(isValidPanCardNo(str5));
    }
}

Python3




# Python3 program to validate the
# PAN Card number using Regular
# Expression
import re
 
# Function to validate the
# PAN Card number.
 
 
def isValidPanCardNo(panCardNo):
 
    # Regex to check valid
    # PAN Card number
    regex = "[A-Z]{5}[0-9]{4}[A-Z]{1}"
 
    # Compile the ReGex
    p = re.compile(regex)
 
    # If the PAN Card number
    # is empty return false
    if(panCardNo == None):
        return False
 
    # Return if the PAN Card number
    # matched the ReGex
    if(re.search(p, panCardNo) and
       len(panCardNo) == 10):
        return True
    else:
        return False
 
# Driver Code.
 
 
# Test Case 1:
str1 = "BNZAA2318J"
print(isValidPanCardNo(str1))
 
# Test Case 2:
str2 = "23ZAABN18J"
print(isValidPanCardNo(str2))
 
# Test Case 3:
str3 = "BNZAA2318JM"
print(isValidPanCardNo(str3))
 
# Test Case 4:
str4 = "BNZAA23184"
print(isValidPanCardNo(str4))
 
# Test Case 5:
str5 = "BNZAA 23184"
print(isValidPanCardNo(str5))
 
# This code is contributed by avanitrachhadiya2155

C++




// C++ program to validate the
// PAN Card number using Regular
//  Expression
 
#include <iostream>
#include <regex>
using namespace std;
 
// Function to validate the
// PAN Card number.
bool isValidPanCardNo(string panCardNo)
{
 
    // Regex to check valid
    // PAN Card number.
    const regex pattern("[A-Z]{5}[0-9]{4}[A-Z]{1}");
 
    // If the PAN Card number
    // is empty return false
    if (panCardNo.empty()) {
        return false;
    }
 
    // Return true if the PAN Card number
    // matched the ReGex
    if (regex_match(panCardNo, pattern))
    {
        return true;
    }
    else
    {
        return false;
    }
}
 
// Driver Code
int main()
{
    // Test Case 1:
    string str1 = "BNZAA2318J";
    cout << isValidPanCardNo(str1) << endl;
 
    // Test Case 2:
    string str2 = "23ZAABN18J";
    cout << isValidPanCardNo(str2) << endl;
 
    // Test Case 3:
    string str3 = "BNZAA2318JM";
    cout << isValidPanCardNo(str3) << endl;
 
    // Test Case 4:
    string str4 = "BNZAA23184";
    cout << isValidPanCardNo(str4) << endl;
 
    // Test Case 5:
    string str5 = "BNZAA 23184";
    cout << isValidPanCardNo(str5) << endl;
 
    return 0;
}
 
// This code is contributed by yuvraj_chandra
Output
true
false
false
false
false

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