Case con clases y Regex

def describe(value)
  case value
  when Integer then "a whole number"
  when Float   then "a decimal"
  when String  then "some text"
  else              "something else"
  end
end

puts describe(42)      # un número entero
puts describe(3.14)    # un decimal
puts describe("hi")    # algo de texto

def kind_of(text)
  case text
  when /^\d+$/        then "all digits"
  when /@/            then "looks like an email"
  when /^[A-Z]/       then "starts with a capital"
  else                     "other"
  end
end