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SSN regex PHP

SSN stands for social security number and is issued to US citizens, permanent and temporary residents.

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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
"/^(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}$/"
Test it!
/^(?!666|000|9\d{2})\d{3}-(?!00)\d{2}-(?!0{4})\d{4}$/

True

False

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Example code in PHP:

// Validate SSN
$ssn_validation_regex = '/^(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}$/'; 
echo preg_match($ssn_validation_regex, '100-22-3333'); // returns 1

// Extract SSN from a string
$extract_ssn_pattern = '/(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4}/'; 
$string_to_match = 'My SSN is 100-22-3333';
preg_match_all($extract_ssn_pattern, $string_to_match, $matches);
print_r($matches[0]) // matches[0] is ['100-22-3333']

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Test it!

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False

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Test it!

True

False

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