SSN regex C#
SSN stands for social security number and is issued to US citizens, permanent and temporary residents.
SSN regex
This number has the following rules:
- consists of 9 digits and usually divided by 3 parts by hyphen (XXX-XX-XXXX).
- The first part can not be 000, 666, or between 900-900.
- Second part can not be 00
- Third part can not be 0000
Below is a simple SSN regular expression that is divided by hyphens.
- If you want to make hyphens optional, put ? after each dash
- If you want to validate SSN without hyphens - just remove them
new Regex("^(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}$")
Enter a text in the input above to see the result
Example code in C#:
using System.Text.RegularExpressions;
using System.Linq;
using System;
public class Program
{
public static void Main()
{
// Validate SSN
Regex validateSSNRegex = new Regex("^(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}$");
Console.WriteLine(validateSSNRegex.IsMatch("100-22-3333")); // prints True
// Extract SSNs from a string
Regex extractSSNRegex = new Regex("(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}");
string [] extracted = extractSSNRegex.Matches("My SSN is 100-22-3333")
.Cast()
.Select(m => m.Value)
.ToArray();
Console.WriteLine(String.Join(",", extracted)); // prints 100-22-3333
}
}
