Advent of Code 2023, Day1 Part2

day1_2.ex

digits =
  (~w(one two three four five six seven eight nine)
  |> Enum.with_index(1) ) ++ ( ~w(1 2 3 4 5 6 7 8 9)
  |> Enum.with_index(1) ) |> Enum.into(%{})
digits = ~w(1 2 3 4 5 6 7 8 9)
  |> Enum.with_index(1) |> Enum.into(digits)

input
|> String.split()
|> Enum.map(fn line ->
  matches =
    Regex.scan(~r/(one|two|three|four|five|six|seven|eight|nine|[1-9])/, line)

  [x, y] =
    [matches |> List.first(), matches |> List.last()]
    |> Enum.map(fn [s, s] -> digits[s] end)

  x * 10 + y
end)
|> Enum.sum()