Capturing regex matching variables in cond

Questions & Help Questions
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10

Here you have it with error handling

defmodule Hello do
  def run(string) do
    {:ok, do_run(string)}
  catch
    :throw, error -> {:error, error}
  end
  
  defp do_run("--"), do: {:latFrame, -1}
  defp do_run("++"), do: {:latFrame, 1}
  defp do_run("-*"), do: {:latEnd, -1}
  defp do_run("+*"), do: {:latEnd, 1}

  defp do_run(<<"+", number::binary>>), do: {:lon, to_integer(number)}
  defp do_run(<<"-", number::binary>>), do: {:lat, -to_integer(number)}
  defp do_run(<<"+", number::binary>>), do: {:lon, to_integer(number)}
  defp do_run(number), do: {:gridNum, to_integer(number)}
  
  defp to_integer(string) do
    case Integer.parse(string) do
      {num, ""} -> num
      _ -> throw({:not_number, string})
    end
  end
end