How to validate PAN Card number using Regular Expression - GeeksforGeeks

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: 
It should be ten characters long.The first five characters should be any upper case alphabets.The next four-characters should be any number from 0 to 9.The last(tenth) character should be any upper case alphabet.It should not contain any white spaces.
It should be ten characters long.
The first five characters should be any upper case alphabets.
The next four-characters should be any number from 0 to 9.
The last(tenth) character should be any upper case alphabet.
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.
[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
Python3
C++
// 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 program to validate the# PAN Card number using Regular# Expressionimport 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++ 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 Codeint 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
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avanitrachhadiya2155
yuvraj_chandra
CPP-regex
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Pattern Searching
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