How to check Aadhaar number is valid or not using Regular Expression
Given string str, the task is to check whether the given string is a valid Aadhaar number or not by using Regular Expression. The valid Aadhaar number must satisfy the following conditions:
- It should have 12 digits.
- It should not start with 0 and 1.
- It should not contain any alphabet and special characters.
- 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 Aadhaar number.
Input: str = “3675 9834 6012 8”
Output: false
Explanation:
The given string contains 13 digits. Therefore, it is not a valid Aadhaar 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 Aadhaar 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 // Aadhaar number using Regular Expression #include <iostream> #include <regex> using namespace std; // Function to validate the Aadhaar number. bool isValidAadhaarNumber(string str) { // Regex to check valid Aadhaar number. const regex pattern( "^[2-9]{1}[0-9]{3}\\s[0-9]{4}\\s[0-9]{4}$" ); // If the Aadhaar number // is empty return false if (str.empty()) { return false ; } // Return true if the Aadhaar number // matched the ReGex if (regex_match(str, pattern)) { return true ; } else { return false ; } } // Driver Code int main() { // Test Case 1: string str1 = "3675 9834 6015" ; cout << isValidAadhaarNumber(str1) << endl; // Test Case 2: string str2 = "4675 9834 6012 8" ; cout << isValidAadhaarNumber(str2) << endl; // Test Case 3: string str3 = "0175 9834 6012" ; cout << isValidAadhaarNumber(str3) << endl; // Test Case 4: string str4 = "3675 98AF 60#2" ; cout << isValidAadhaarNumber(str4) << endl; // Test Case 5: string str5 = "417598346012" ; cout << isValidAadhaarNumber(str5) << endl; return 0; } // This code is contributed by yuvraj_chandra |
Java
// Java program to check valid // Aadhaar number using regex. import java.util.regex.*; class GFG { // Function to validate Aadhaar number. public static boolean isValidAadhaarNumber(String str) { // Regex to check valid Aadhaar number. String regex = "^[2-9]{1}[0-9]{3}\\s[0-9]{4}\\s[0-9]{4}$" ; // 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(isValidAadhaarNumber(str1)); // Test Case 2: String str2 = "4675 9834 6012 8" ; System.out.println(isValidAadhaarNumber(str2)); // Test Case 3: String str3 = "0175 9834 6012" ; System.out.println(isValidAadhaarNumber(str3)); // Test Case 4: String str4 = "3675 98AF 60#2" ; System.out.println(isValidAadhaarNumber(str4)); // Test Case 5: String str5 = "417598346012" ; System.out.println(isValidAadhaarNumber(str5)); } } |
Python3
# Python3 program to validate # Aadhaar number using regex. import re # Function to validate Aadhaar # number. def isValidAadhaarNumber( str ): # Regex to check valid # Aadhaar 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 (isValidAadhaarNumber(str1)) # Test Case 2: str2 = "4675 9834 6012 8" print (isValidAadhaarNumber(str2)) # Test Case 3: str3 = "0175 9834 6012" print (isValidAadhaarNumber(str3)) # Test Case 4: str4 = "3675 98AF 60#2" print (isValidAadhaarNumber(str4)) # Test Case 5: str5 = "417598346012" print (isValidAadhaarNumber(str5)) # This code is contributed by avanitrachhadiya2155 |
true false false false false