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<!-- livebook:{"file_entries":[{"name":"day3_example.txt","type":"attachment"},{"name":"day3_example2.txt","type":"attachment"},{"name":"day3_input.txt","type":"attachment"}]} -->
# Day 3
```elixir
Mix.install([
{:kino, "~> 0.14.2"}
])
```
## Part 1
https://adventofcode.com/2024/day/3
```elixir
input = Kino.FS.file_path("day3_input.txt") |> File.read!()
do_math = fn input_ ->
Regex.scan(~r/mul\((\d+)(?:,)(\d+)\)/, input_, capture: :all_but_first)
|> Enum.map(fn match -> Enum.map(match, &String.to_integer/1) end)
|> Enum.map(&Enum.product/1)
|> Enum.sum()
end
result = do_math.(input)
```
## Part 2
```elixir
removable_sections = Regex.scan(~r/don\'t\(\).+?do\(\)/s, input)
defmodule Remover do
def remove_all(string, []), do: string
def remove_all(string, [substring | remaining]) do
new = String.replace(string, substring, "")
remove_all(new, remaining)
end
end
result = Remover.remove_all(input, removable_sections)
|> do_math.()
```
See source 
