# How to validate PAN Card number using Regular Expression

Given a string str of alphanumeric characters, the task is to check whether the string is 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 contains 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.

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: This problem can be solved by using Regular Expression.

1. Get the string.
2. Create a regular expression to validate 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.
3. Match the given string with the regex, in Java this can be done using Pattern.matcher().
4. Return true if the string matches with the given regex, else return false.

Below is the implementation of the above approach:

 `// 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)); ` `    ``} ` `} `

Output:

```true
false
false
false
false
```

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