# How to validate SSN (Social Security Number) using Regular Expression

• Last Updated : 25 Nov, 2022

Given string str, the task is to check whether the given string is valid SSN (Social Security Number) or not by using Regular Expression
The valid SSN (Social Security Number) must satisfy the following conditions:

1. It should have 9 digits.
2. It should be divided into 3 parts by hyphen (-).
3. The first part should have 3 digits and should not be 000, 666, or between 900 and 999.
4. The second part should have 2 digits and it should be from 01 to 99.
5. The third part should have 4 digits and it should be from 0001 to 9999.

Examples:

Input: str = “856-45-6789”;
Output: true
Explanation: The given string satisfies all the above mentioned conditions. Therefore, it is a valid SSN (Social Security Number).

Input: str = “000-45-6789”;
Output: false
Explanation: The given string starts with 000. Therefore, it is not a valid SSN (Social Security Number).

Input: str = “856-452-6789”;
Output: false
Explanation: The second part of this string has 3 digits. Therefore, it is not a valid SSN (Social Security Number).

Input: str = “856-45-0000”;
Output: false
Explanation: The third part of this string is 0000. Therefore, it is not a valid SSN (Social Security 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 SSN (Social Security Number) as mentioned below:
`regex = "^(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}\$";`
• Where:
• ^ represents the starting of the string.
• (?!666|000|9\\d{2})\\d{3} represents the first 3 digits should not start with 000, 666, or between 900 and 999.
• represents the string followed by a hyphen (-).
• (?!00)\\d{2} represents the next 2 digits should not start with 00 and it should be any from 01-99.
• represents the string followed by a hyphen (-).
• (?!0{4})\\d{4} represents the next 4 digits can’t 0000 and it should be any from 0001-9999.
• \$ 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``// SSN (Social Security Number)``// using Regular Expression``#include ``#include ``using` `namespace` `std;` `// Function to validate the SSN``// (Social Security Number)``bool` `isValidSSN(string str)``{` `    ``// Regex to check valid SSN``    ``// (Social Security Number)``    ``const` `regex pattern(``"^(?!666|000|9\\d{2})"``                        ``"\\d{3}-(?!00)"``                        ``"\\d{2}-(?!0{4})\\d{4}\$"``);` `    ``// If the SSN (Social Security Number)``    ``// is empty return false``    ``if` `(str.empty())``    ``{``        ``return` `false``;``    ``}` `    ``// Return true if the SSN``    ``// (Social Security Number)``    ``// matched the ReGex``    ``if` `(regex_match(str, pattern))``    ``{``        ``return` `true``;``    ``}``    ``else` `{``        ``return` `false``;``    ``}``}` `// Driver Code``int` `main()``{``    ``// Test Case 1:``    ``string str1 = ``"856-45-6789"``;``    ``cout << isValidSSN(str1) << endl;` `    ``// Test Case 2:``    ``string str2 = ``"000-45-6789"``;``    ``cout << isValidSSN(str2) << endl;` `    ``// Test Case 3:``    ``string str3 = ``"856-452-6789"``;``    ``cout << isValidSSN(str3) << endl;` `    ``// Test Case 4:``    ``string str4 = ``"856-45-0000"``;``    ``cout << isValidSSN(str4) << endl;` `    ``return` `0;``}` `// This code is contributed by yuvraj_chandra`

## Java

 `// Java program to check valid``// SSN (Social Security Number) using``// regex.``import` `java.util.regex.*;``class` `GFG {` `    ``// Function to validate``    ``// SSN (Social Security Number).``    ``public` `static` `boolean` `isValidSSN(String str)``    ``{``        ``// Regex to check SSN``        ``// (Social Security Number).``        ``String regex = ``"^(?!666|000|9\\d{2})\\d{3}"``                       ``+ ``"-(?!00)\\d{2}-"``                       ``+``"(?!0{4})\\d{4}\$"``;` `        ``// Compile the ReGex``        ``Pattern p = Pattern.compile(regex);` `        ``// If the string is empty``        ``// return false``        ``if` `(str == ``null``)``        ``{``            ``return` `false``;``        ``}` `        ``// Pattern class contains matcher()``        ``//  method to find matching between``        ``//  given string and regular expression.``        ``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 = ``"856-45-6789"``;``        ``;``        ``System.out.println(isValidSSN(str1));` `        ``// Test Case 2:``        ``String str2 = ``"000-45-6789"``;``        ``;``        ``System.out.println(isValidSSN(str2));` `        ``// Test Case 3:``        ``String str3 = ``"856-452-6789"``;``        ``System.out.println(isValidSSN(str3));` `        ``// Test Case 4:``        ``String str4 = ``"856-45-0000"``;``        ``System.out.println(isValidSSN(str4));``    ``}``}`

## Python3

 `# Python3 program to validate``# SSN (Social Security Number)``# using regular expression``import` `re` `# Function to validate SSN``# (Social Security Number).`  `def` `isValidSSN(``str``):` `    ``# Regex to check valid``    ``# SSN (Social Security Number).``    ``regex ``=` `"^(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{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 ``=` `"856-45-6789"``print``(isValidSSN(str1))` `# Test Case 2:``str2 ``=` `"000-45-6789"``print``(isValidSSN(str2))` `# Test Case 3:``str3 ``=` `"856-452-6789"``print``(isValidSSN(str3))` `# Test Case 4:``str4 ``=` `"856-45-0000"``print``(isValidSSN(str4))` `# This code is contributed by avanitrachhadiya2155`

## Javascript

 `// Javascript program to validate``// SSN (Social Security Number) using Regular Expression` `// Function to validate the``// SSN Code``function` `isValidSSN(str) {``    ``// Regex to check valid``    ``// SSN CODE``    ``let regex = ``new` `RegExp(/^(?!666|000|9\d{2})\d{3}-(?!00)\d{2}-(?!0{4})\d{4}\$/);` `    ``//  if str CODE``    ``// is empty return false``    ``if` `(str == ``null``) {``        ``return` `"false"``;``    ``}` `    ``// Return true if the str``    ``// matched the ReGex``    ``if` `(regex.test(str) == ``true``) {``        ``return` `"true"``;``    ``}``    ``else` `{``        ``return` `"false"``;``    ``}``}` `// Driver Code``// Test Case 1:``let str1 = ``"856-45-6789"``;``console.log(isValidSSN(str1));` `// Test Case 2:``let str2 = ``"000-45-6789"``;``console.log(isValidSSN(str2));` `// Test Case 3:``let str3 = ``"856-452-6789"``;``console.log(isValidSSN(str3));` `// Test Case 4:``let str4 = ``"856-45-0000"``;``console.log(isValidSSN(str4));` `// This code is contributed by Rahul Chauhan`

Output

```true
false
false
false```

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