How to find out if whole string is upper case in Elixir?

Question

How can I find out whether a whole string is uppercase in Elixir?

I've found a solution here. But it only addresses one letter at a time not the whole string.

Answer 1

You can use Regex:

iex> str = "Hello World"
iex> str =~ ~r(^[^a-z]*$)
false

iex> str = "HELLO WORLD"
iex> str =~ ~r(^[^a-z]*$)
true