public static boolean isSSN(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        String normalizedSSN = stripCharsInBag(s, SSNDelimiters);

        return (isInteger(normalizedSSN) && normalizedSSN.length() == digitsInSocialSecurityNumber);
    }
public static boolean isSSN ( String s ) { if ( isEmpty ( s ) ) return defaultEmptyOK ; String normalizedSSN = stripCharsInBag ( s , SSNDelimiters ) ; return ( isInteger ( normalizedSSN ) && normalizedSSN . length ( ) == digitsInSocialSecurityNumber ) ; }
isSSN returns true if string s is a valid U.S. Social Security Number.  Must be 9 digits.