How to validate CVV number using Regular Expression - GeeksforGeeks (2024)

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Last Updated : 21 Dec, 2022

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Given string str, the task is to check whether it is a valid CVV (Card Verification Value) number or not by using Regular Expression.
The valid CVV (Card Verification Value) number must satisfy the following conditions:

  1. It should have 3 or 4 digits.
  2. It should have a digit between 0-9.
  3. It should not have any alphabet or special characters.

Examples:

Input: str = “561”
Output: true
Explanation:
The given string satisfies all the above mentioned conditions. Therefore, it is a valid CVV (Card Verification Value) number.

Input: str = “50614”
Output: false
Explanation:
The given string has five-digit. Therefore, it is not a valid CVV (Card Verification Value) number.

Input: str = “5a#1”
Output: false
Explanation: The given string has alphabets and special characters. Therefore, it is not a valid CVV (Card Verification Value) 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 the valid CVV (Card Verification Value) number as mentioned below:
regex = "^[0-9]{3, 4}$";
  • Where:
    • ^ represents the starting of the string.
    • [0-9] represents the digit between 0-9.
    • {3, 4} represents the string that has 3 or 4 digits.
    • $ 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

// CVV (Card Verification Value) number

// using Regular Expression

#include <iostream>

#include <regex>

using namespace std;

// Function to validate the CVV

// (Card Verification Value) number

bool isValidCVVNumber(string str)

{

// Regex to check valid CVV

// (Card Verification Value) number

const regex pattern("^[0-9]{3,4}$");

// If the CVV (Card Verification Value)

// number is empty return false

if (str.empty())

{

return false;

}

// Return true if the CVV

// (Card Verification Value) number

// matched the ReGex

if (regex_match(str, pattern))

{

return true;

}

else

{

return false;

}

}

// Driver Code

int main()

{

// Test Case 1:

string str1 = "561";

cout << isValidCVVNumber(str1) << endl;

// Test Case 2:

string str2 = "5061";

cout << isValidCVVNumber(str2) << endl;

// Test Case 3:

string str3 = "50614";

cout << isValidCVVNumber(str3) << endl;

// Test Case 4:

string str4 = "5a#1";

cout << isValidCVVNumber(str4) << endl;

return 0;

}

See Also
Cardholder Verification Methods: Concepts, Implementations, and ImpactsWhat is CVV on Debit Card? - Complete Information

// This code is contributed by yuvraj_chandra

 
Java
 
// Java program to validate
// CVV (Card Verification Value)
// number using regex.
import java.util.regex.*;
class GFG {
// Function to validate
// CVV (Card Verification Value) number.
// using regular expression.
public static boolean isValidCVVNumber(String str)
{
// Regex to check valid CVV number.
String regex = "^[0-9]{3,4}$";
// Compile the ReGex
Pattern p = Pattern.compile(regex);
// If the string is empty
// return false
if (str == null) 
{
return false;
}
// Find match between given string
// and regular expression
// using Pattern.matcher()
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 = "561";
System.out.println(isValidCVVNumber(str1));
// Test Case 2:
String str2 = "5061";
System.out.println(isValidCVVNumber(str2));
// Test Case 3:
String str3 = "50614";
System.out.println(isValidCVVNumber(str3));
// Test Case 4:
String str4 = "5a#1";
System.out.println(isValidCVVNumber(str4));
}
}
 
 
Python3
 
# Python3 program to validate
# CVV (Card Verification Value)
# number using regex.
import re
# Function to validate
# CVV (Card Verification Value) number.
# using regular expression.
def isValidCVVNumber(str):
# Regex to check valid
# CVV number.
regex = "^[0-9]{3,4}$"
# 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 = "561"
print(isValidCVVNumber(str1))
# Test Case 2:
str2 = "5061"
print(isValidCVVNumber(str2))
# Test Case 3:
str3 = "50614"
print(isValidCVVNumber(str3))
# Test Case 4:
str4 = "5a#1"
print(isValidCVVNumber(str4))
# This code is contributed by avanitrachhadiya2155
 
 
C#
 
// C# program to validate the
// CVV (Card Verification Value) number
//using Regular Expressions
using System;
using System.Text.RegularExpressions;
class GFG
{
// Main Method
static void Main(string[] args)
{
// Input strings to Match
// CVV (Card Verification Value) number
string[] str={"561","5061","50614","5a#1"};
foreach(string s in str) {
Console.WriteLine( isValidCVVNumber(s) ? "true" : "false");
}
Console.ReadKey(); }
// method containing the regex
public static bool isValidCVVNumber(string str)
{
string strRegex = @"^[0-9]{3,4}$";
Regex re = new Regex(strRegex);
if (re.IsMatch(str))
return (true);
else
return (false);
}
}
// This code is contributed by Rahul Chauhan
 
 
Javascript
 
// Javascript program to validate
// CVV Number using Regular Expression
// Function to validate the
// CVV_Number 
function isValid_CVV_Number(CVV_Number) {
// Regex to check valid
// CVV_Number 
let regex = new RegExp(/^[0-9]{3,4}$/);
// if CVV_Number 
// is empty return false
if (CVV_Number == null) {
return "false";
}
// Return true if the CVV_Number
// matched the ReGex
if (regex.test(CVV_Number) == true) {
return "true";
}
else {
return "false";
}
}
// Driver Code
// Test Case 1:
let str1 = "561";
console.log(isValid_CVV_Number(str1));
// Test Case 2:
let str2 = "5061";
console.log(isValid_CVV_Number(str2));
// Test Case 3:
let str3 = "50614";
console.log(isValid_CVV_Number(str3));
// Test Case 4:
let str4 = "5a#1";
console.log(isValid_CVV_Number(str4));
// Test Case 5:
let str5 = "12071998";
console.log(isValid_CVV_Number(str5));
// Test Case 6:
let str6 = "RAH12071998";
console.log(isValid_CVV_Number(str6));
// This code is contributed by Rahul Chauhan
 
 
Output
truetruefalsefalse
Time Complexity: O(N) for each testcase, where N is the length of the given string.
Auxiliary Space: O(1) 

 
 
 
   
 
 
 
 
 
 
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'); $('.spinner-loading-overlay').show(); // send this option via create-improvement-post api jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.improvement-reason-modal').hide(); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); }); 
 
 
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 `; $('body').append(adBlockerModal); $('body').addClass('body-for-ad-blocker'); const modal = document.getElementById("adBlockerModal"); modal.style.display = "block"; } function handleAdBlockerClick(type){ if(type == 'disabled'){ window.location.reload(); } else if(type == 'info'){ document.getElementById("ad-blocker-div").style.display = "none"; document.getElementById("ad-blocker-info-div").style.display = "flex"; handleAdBlockerIconClick(0); } } var lastSelected= null; //Mapping of name and video URL with the index. const adBlockerVideoMap = [ ['Ad Block Plus','https://media.geeksforgeeks.org/auth-dashboard-uploads/abp-blocker-min.mp4'], ['Ad Block','https://media.geeksforgeeks.org/auth-dashboard-uploads/Ad-block-min.mp4'], ['uBlock Origin','https://media.geeksforgeeks.org/auth-dashboard-uploads/ub-blocke-min.mp4'], ['uBlock','https://media.geeksforgeeks.org/auth-dashboard-uploads/U-blocker-min.mp4'], ] function handleAdBlockerIconClick(currSelected){ const videocontainer = document.getElementById('ad-blocker-info-div-gif'); const videosource = document.getElementById('ad-blocker-info-div-gif-src'); if(lastSelected != null){ document.getElementById("ad-blocker-info-div-icons-"+lastSelected).style.backgroundColor = "white"; document.getElementById("ad-blocker-info-div-icons-"+lastSelected).style.borderColor = "#D6D6D6"; } document.getElementById("ad-blocker-info-div-icons-"+currSelected).style.backgroundColor = "#D9D9D9"; document.getElementById("ad-blocker-info-div-icons-"+currSelected).style.borderColor = "#848484"; document.getElementById('ad-blocker-info-div-name-span').innerHTML = adBlockerVideoMap[currSelected][0] videocontainer.pause(); videosource.setAttribute('src', adBlockerVideoMap[currSelected][1]); videocontainer.load(); videocontainer.play(); lastSelected = currSelected; }  

                                                        How to validate CVV number using Regular Expression - GeeksforGeeks (2024)
                        

                            
                        

                    
                                                                                
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Author:  Roderick King 

    
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