# How to validate PAN Card number using Regular Expression

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:

1. It should be ten characters long.
2. The first five characters should be any upper case alphabets.
3. The next four-characters should be any number from 0 to 9.
4. The last(tenth) character should be any upper case alphabet.
5. 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.
• 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

 `// 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

 `# Python3 program to validate the ` `# PAN Card number using Regular ` `# Expression ` `import` `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`

Output:

```true
false
false
false
false

```

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