Chapter 12 - Regular Expressions and Finite-State Automata - Exercise Set 12.1 - Page 790: 37

[0 − 9]{3} - [0 − 9]{2} - [0 − 9]{4}

All United States social security numbers (which consist of three digits, a hyphen, two digits, another hyphen, and finally four more digits), where the final four digits start with a 3 and end with a 6 will be as --[0 − 9]{3} - [0 − 9]{2} - [0 − 9]{4}