def format_ssns(string)
  # sub = string.scan(", ")
  # p sub

    if string == (/\d{9}/)
      string.gsub(/(\d{3})(\d{2})(\d{4})/, "\\1-\\2-\\3")
    elsif string == /(\d{3})\W?(\d{2})\W?(\d{4})/
      string.gsub(/(\d{3})\W?(\d{2})\W?(\d{4})/, "\\1-\\2-\\3")
    end
end

puts has_ssn?("123456789")
puts has_ssn?("123-45-6789")
puts has_ssn?("123")

p format_ssns("123456789, 350.80.0744, 013-60-8762")