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How to check Aadhar number is valid or not using Regular Expression
  • Last Updated : 04 Feb, 2021

Given string str, the task is to check whether the given string is a valid Aadhar number or not by using Regular Expression. The valid Aadhar number must satisfy the following conditions: 

  1. It should have 12 digits.
  2. It should not start with 0 and 1.
  3. It should not contain any alphabet and special characters.
  4. It should have white space after every 4 digits.

Examples: 

Input: str = “3675 9834 6012” 
Output: true 
Explanation: 
The given string satisfies all the above mentioned conditions. Therefore, it is a valid Aadhar number.
Input: str = “3675 9834 6012 8” 
Output: false 
Explanation: 
The given string contains 13 digits. Therefore, it is not a valid Aadhar number. 

Approach: The idea is to use Regular Expression to solve this problem. The following steps can be followed to compute the answer: 

  • Get the String.
  • Create a regular expression to check valid Aadhar number as mentioned below:

regex = “^[2-9]{1}[0-9]{3}\\s[0-9]{4}\\s[0-9]{4}$”;

  • Where: 
    • ^ represents the starting of the string.
    • [2-9]{1} represents the first digit should be any from 2-9.
    • [0-9]{3} represents the next 3 digits after the first digit should be any digit from 0-9.
    • \\s represents white space.
    • [0-9]{4} represents the next 4 digits should be any from 0-9.
    • \\s represents white space.
    • [0-9]{4} represents the next 4 digits should be any from 0-9.
    • $ represents the ending of the string.
  • Match the given string with the regular expression. In Java, this can be done by using Pattern.matcher().
  • Return true if the string matches with the given regular expression, else return false.

Below is the implementation of the above approach:
 

C++




// C++ program to validate the
// Aadhar number using Regular Expression
#include <iostream>
#include <regex>
using namespace std;
 
// Function to validate the Aadhar number.
bool isValidAadharNumber(string str)
{
 
  // Regex to check valid Aadhar number.
  const regex pattern("^[2-9]{1}[0-9]{3}\\s[0-9]{4}\\s[0-9]{4}$");
 
  // If the Aadhar number
  // is empty return false
  if (str.empty())
  {
     return false;
  }
 
  // Return true if the Aadhar number
  // matched the ReGex
  if(regex_match(str, pattern))
  {
    return true;
  }
  else
  {
    return false;
  }
}
 
// Driver Code
int main()
{
  // Test Case 1:
  string str1 = "3675 9834 6015";
  cout << isValidAadharNumber(str1) << endl;
 
  // Test Case 2:
  string str2 = "4675 9834 6012 8";
  cout << isValidAadharNumber(str2) << endl;
 
  // Test Case 3:
  string str3 = "0175 9834 6012";
  cout << isValidAadharNumber(str3) << endl;
 
  // Test Case 4:
  string str4 = "3675 98AF 60#2";
  cout << isValidAadharNumber(str4) << endl;
 
  // Test Case 5:
  string str5 = "417598346012";
  cout << isValidAadharNumber(str5) << endl;
  return 0;
}
 
// This code is contributed by yuvraj_chandra

Java




// Java program to check valid
// Aadhar number using regex.
 
import java.util.regex.*;
class GFG {
 
    // Function to validate Aadhar number.
    public static boolean
    isValidAadharNumber(String str)
    {
        // Regex to check valid Aadhar number.
        String regex
            = "^[2-9]{1}[0-9]{3}\\s[0-9]{4}\\s[0-9]{4}$";
 
        // Compile the ReGex
        Pattern p = Pattern.compile(regex);
 
        // If the string is empty
        // return false
        if (str == null) {
            return false;
        }
 
        // Pattern class contains matcher() method
        // to find matching between given string
        // and regular expression.
        Matcher m = p.matcher(str);
 
        // Return if the string
        // matched the ReGex
        return m.matches();
    }
 
    // Driver Code.
    public static void main(String args[])
    {
 
        // Test Case 1:
        String str1 = "3675 9834 6015";
        System.out.println(isValidAadharNumber(str1));
 
        // Test Case 2:
        String str2 = "4675 9834 6012 8";
        System.out.println(isValidAadharNumber(str2));
 
        // Test Case 3:
        String str3 = "0175 9834 6012";
        System.out.println(isValidAadharNumber(str3));
 
        // Test Case 4:
        String str4 = "3675 98AF 60#2";
        System.out.println(isValidAadharNumber(str4));
 
        // Test Case 5:
        String str5 = "417598346012";
        System.out.println(isValidAadharNumber(str5));
    }
}

Python3




# Python3 program to validate
# Aadhar number using regex.
import re
 
# Function to validate Aadhar
# number.
def isValidAadharNumber(str):
 
    # Regex to check valid
    # Aadhar number.
    regex = ("^[2-9]{1}[0-9]{3}\\" +
             "s[0-9]{4}\\s[0-9]{4}$")
     
    # Compile the ReGex
    p = re.compile(regex)
 
    # If the string is empty
    # return false
    if (str == None):
        return False
 
    # Return if the string
    # matched the ReGex
    if(re.search(p, str)):
        return True
    else:
        return False
 
# Driver code
 
# Test Case 1:
str1 = "3675 9834 6015"
print(isValidAadharNumber(str1))
 
# Test Case 2:
str2 = "4675 9834 6012 8"
print(isValidAadharNumber(str2))
 
# Test Case 3:
str3 = "0175 9834 6012"
print(isValidAadharNumber(str3))
 
# Test Case 4:
str4 = "3675 98AF 60#2"
print(isValidAadharNumber(str4))
 
# Test Case 5:
str5 = "417598346012"
print(isValidAadharNumber(str5))
 
# This code is contributed by avanitrachhadiya2155
Output: 
true
false
false
false
false

 




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