part 1 done

Cargo.toml

@@ -25,6 +25,8 @@ test_lib = []
 chrono = { version = "0.4.38", optional = true }
 dhat = { version = "0.3.3", optional = true }
 pico-args = "0.5.0"
+regex = "1.11.1"
 tinyjson = "2.5.1"
+winnow = "0.6.20"
 
 # Solution dependencies

data/examples/03.txt

@@ -0,0 +1 @@
+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))

src/bin/03.rs

@@ -0,0 +1,41 @@
+use regex::Regex;
+
+advent_of_code::solution!(3);
+
+#[must_use]
+pub fn part_one(input: &str) -> Option<u32> {
+    let re = Regex::new(r"mul\((?<n1>\d{1,3}),(?<n2>\d{1,3})\)").unwrap();
+    Some(
+        re.captures_iter(input)
+            .map(|caps| {
+                let (_full, [n1, n2]) = caps.extract();
+                (n1, n2)
+            })
+            .map(|(n1, n2)| (n1.parse::<u32>().unwrap(), n2.parse::<u32>().unwrap()))
+            .map(|(n1, n2)| n1 * n2)
+            .sum(),
+    )
+}
+
+#[must_use]
+pub fn part_two(input: &str) -> Option<u32> {
+    // let x = parse_3(input);
+    todo!()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part_one() {
+        let result = part_one(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, Some(161));
+    }
+
+    #[test]
+    fn test_part_two() {
+        let result = part_two(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, todo!());
+    }
+}