acronym elixir solution

elixir/acronym/lib/acronym.ex

@@ -0,0 +1,14 @@
+defmodule Acronym do
+  @doc """
+  Generate an acronym from a string.
+  "This is a string" => "TIAS"
+  """
+  @spec abbreviate(String.t()) :: String.t()
+  def abbreviate(string) do
+    string
+    |> String.split(~r/\s|[-]|(?<=[a-z])-(?=[A-Z])|(?<=[a-z])(?=[A-Z])/)
+    |> Enum.filter(&String.match?(&1, ~r/^\w/))
+    |> Enum.map(&String.upcase(String.at(String.trim(&1, "_"), 0)))
+    |> Enum.join("")
+  end
+end