Day 5: Doesn't He Have Intern-Elves For This?

day_5_doesnt_he_have_internelves_for_this.livemd

Eli Chen

@elichen

aoc2015

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Day 5: Doesn’t He Have Intern-Elves For This?

Section

defmodule P1 do
  def three_vowels?(s) do
    Regex.scan(~r/[aeiouAEIOU]/, s)
    |> Enum.count() >= 3
  end

  def repeated_letter?(s) do
    Regex.match?(~r/(.)\1/, s)
  end

  def contain_strings?(s) do
    not Regex.match?(~r/ab|cd|pq|xy/, s)
  end

  def nice?(s) do
    three_vowels?(s) and repeated_letter?(s) and contain_strings?(s)
  end
end

{:ok, data} = File.read("/Users/eli/Desktop/input.txt")

data
|> String.split()
|> Enum.count(&amp;P1.nice?/1)

defmodule P2 do
  def pair_letters?(s) do
    Regex.match?(~r/(..).*\1/, s)
  end

  def xyx?(s) do
    Regex.match?(~r/(.).\1/, s)
  end

  def nice?(s) do
    pair_letters?(s) and xyx?(s)
  end
end

{:ok, data} = File.read("/Users/eli/Desktop/input.txt")

data
|> String.split()
|> Enum.count(&amp;P2.nice?/1)

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