gistfile1.ex

import M

File.read("match.exs") |> match({:ok, bin}, bin) |> String.length
#=> 156

s = """
id;name;value
1;foo;hi
2;bar;bye
"""

s
|> String.strip
|> String.split("\n")
|> Enum.map(&String.split(&1, ";"))
|> Enum.map(&match(&1, [_,name,_], name))
#=> ["name", "foo", "bar"]

match.exs

defmodule M do
  defmacro match(thing, pattern, selector) do
    quote do
      unquote(pattern) = unquote(thing)
      unquote(selector)
    end
  end
end