Untitled notebook

Mix.install([
  {:nimble_parsec, "~> 1.3"}
])

Section

defmodule PhoneNumber.Parser do
  import NimbleParsec

  trunk_prefix = string("0")

  country_code = string("+91")

  digit = utf8_string([?0..?9], 10)

  code = choice([country_code, trunk_prefix])

  number = digit |> times(1)

  indian_phone_number = code |> concat(number) |> eos()

  defparsec(:parse, indian_phone_number)
end

PhoneNumber.Parser.parse("+919870827360") |> IO.inspect()
PhoneNumber.Parser.parse("09870827360") |> IO.inspect()