···

       
25
       
25
       
 
       
## Part 1

     

       
26
       
26
       
 
       


     

       
27
       
27
       
 
       
```elixir

     

       
28
       
28
       
-
       
Regex.scan(~r/mul\((\d{1,3}),(\d{1,3})\)/, puzzle_input, captures: true)

     

       
28
       
28
       
+
       
Regex.scan(~r/mul\((\d{1,3}),(\d{1,3})\)/, puzzle_input)

     

       
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|> Enum.reduce(0, fn [_, a, b], acc ->

     

       
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  acc + String.to_integer(a) * String.to_integer(b)

     

       
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31
       
 
       
end)

     
···

       
40
       
40
       
 
       
## Part 2

     

       
41
       
41
       
 
       


     

       
42
       
42
       
 
       
```elixir

     

       
43
       
43
       
-
       
Regex.scan(~r/do(n't)?\(\)|mul\((\d{1,3}),(\d{1,3})\)/, puzzle_input, captures: true)

     

       
43
       
43
       
+
       
Regex.scan(~r/do(n't)?\(\)|mul\((\d{1,3}),(\d{1,3})\)/, puzzle_input)

     

       
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|> Enum.reduce({true, 0}, fn

     

       
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  ["do()" | _], {_, sum} -> {true, sum}

     

       
46
       
46
       
 
       
  ["don't()" | _], {_, sum} -> {false, sum}

     
···

       
56
       
56
       
 
       
74361272

     

       
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57
       
 
       
```

     

       
58
       
58
       
 
       


     

       
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