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:
- It should have 3 or 4 digits.
- It should have a digit between 0-9.
- It should not have any alphabets and 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 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 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:
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}$" ; // Compile the ReGex Pattern p = Pattern.compile(regex); // If the string is empty // return false if (str == null ) { return false ; } // Find match between given string // and regular expression // uaing Pattern.matcher() Matcher m = p.matcher(str); // Return if the string // matched the ReGex return m.matches(); } // Driver code public static void main(String args[]) { // Test Case 1: String str1 = "561" ; System.out.println(isValidCVVNumber(str1)); // Test Case 2: String str2 = "5061" ; System.out.println(isValidCVVNumber(str2)); // Test Case 3: String str3 = "50614" ; System.out.println(isValidCVVNumber(str3)); // Test Case 4: String str4 = "5a#1" ; System.out.println(isValidCVVNumber(str4)); } } |
Python3
# Python3 program to validate # CVV (Card Verification Value) # number using regex. import re # Function to validate # CVV (Card Verification Value) number. # using regular expression. def isValidCVVNumber( str ): # Regex to check valid # CVV number. regex = "^[0-9]{3,4}$" # 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 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; } // This code is contributed by yuvraj_chandra |
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