day3 part2

input/day3_part2.test.txt

···
+xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))

src/lib.rs

···
         let products: u32 = multiplicands.into_iter().map(|(l, r)| l * r).sum();
         products.to_string()
     }
+
+    pub fn day3_part2(input: &str) -> String {
+        let r = Regex::new(r"(?:do\(\))|(?:don't\(\))|(?:mul\((\d+),(\d+)\))").unwrap();
+        let mut multiply = true;
+        let mut products: Vec<(u32, u32)> = vec![];
+        for captures in r.captures_iter(input) {
+            dbg!(&captures);
+            if &captures[0] == "do()" {
+                multiply = true;
+            } else if &captures[0] == "don't()" {
+                multiply = false;
+            } else if multiply {
+                products.push((captures[1].parse().unwrap(), captures[2].parse().unwrap()));
+            }
+        }
+        let sum: u32 = products.into_iter().map(|(l, r)| l * r).sum();
+        sum.to_string()
+    }
 }
 
 #[cfg(test)]
···
         assert_eq!(test_result, "161");
         let result = day3::day3_part1(include_str!("../input/day3.txt"));
         assert_eq!(result, "183788984");
+    }
+
+    #[test]
+    fn day3_part2_test() {
+        let test_result = day3::day3_part2(include_str!("../input/day3_part2.test.txt"));
+        assert_eq!(test_result, "48");
+        let result = day3::day3_part2(include_str!("../input/day3.txt"));
+        assert_eq!(result, "62098619");
     }
 
     #[test]