diff --git a/Cargo.lock b/Cargo.lock
index 8a3a989..40d934d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,8 +19,9 @@ checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
 
 [[package]]
 name = "advent-of-code-2024"
-version = "24.2.2"
+version = "24.3.2"
 dependencies = [
+ "regex-lite",
  "reqwest",
 ]
 
@@ -727,6 +728,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex-lite"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53a49587ad06b26609c52e423de037e7f57f20d53535d66e08c695f347df952a"
+
 [[package]]
 name = "reqwest"
 version = "0.12.9"
diff --git a/Cargo.toml b/Cargo.toml
index b1bc0ec..1fa8d52 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 authors = ["Toby <toby@tobot.dev>"]
 name = "advent-of-code-2024"
-version = "24.2.2"
+version = "24.3.2"
 edition = "2021"
 default-run = "get_input"
 
@@ -39,6 +39,11 @@ path = "day01/main.rs"
 name = "day02"
 path = "day02/main.rs"
 
+[[bin]]
+name = "day03"
+path = "day03/main.rs"
+
 [dependencies]
+regex-lite = "0.1.6"
 reqwest = { version = "0.12.9", features = ["blocking"] }
 
diff --git a/day03/input.txt b/day03/input.txt
new file mode 100644
index 0000000..7ca1d6d
--- /dev/null
+++ b/day03/input.txt
@@ -0,0 +1,6 @@
+~-mul(858,892)?@#mul(380,985)what()[^what()%mul(340,11)~*}don't())/~-mul(849,387)%-why()when():how()>-,what()mul(605,504)what()~:]what();how()who()];mul(771,783)?^ who()}~?>mul(111,830))@ ~mul(329,797)%'why()why()mul(125,409)-*/where()()@&!why()mul(390,37)when(974,538)#/when()){/don't()/mul(20,990)}?%{(who()mul(627,567)(how()'<(#%how()mul(387,315){;%who()%#from()mul(868,680)}^$mul(862,19)mul(847,689)>((#@when()}mul(339,156)+/{}@{^%[why(231,704)mul(236,754)]'^where(978,690)mul(460,872)#'*mul(518,944)>mul(301,886))mul(477,933)^mul(685,909)who())]what(288,791)mul(170,434){ &where()~(@where()mul(191,104)mul(637,600)&select()why())~select()mul(534,617)?mul(763,508){from()when(22,266)+who() when()mul(204,352)when()mul(426,122)-<*where()'$ why()mul(192,980)[(#[!$-}mul(798,208)''[!where()what()select()mul(295,727))#)}($<?<mul(452,502)(don't()mul(737,492)>,$%where(539,126)what()when()select()'@mul(311,541),?don't()#select()!}!(}&?mul(100,142)),-}%mul(222,856)~$;>!from()where()mul(758,901)mul(757,796)mul(976,686);@'~+-{#who()mul(26,971);mul(404,362)^~who(417,106)what()#mul(186,691)from() %#+{/mul(67,433)-who()!-+!mul(184,469)*when()[&when(458,221)<$mul(163,556)^)]?,'}&+who()mul(514,239)~)(mul(143,441)'how(741,776)~who(766,575)when();>*^mul(281,143)+!>;+:mul(767,44)#<mul(490,849)> when()why()don't()how()from()[from()from(){mul(436,519)what() *who();@{,>do()%'mul(19,540)when()mul(643,539)~when(812,543)mul(527,639)-!mul(409,379)where()/(mul(168,491)#$>]mul(432,333)@%<when();{?what()^mul(819,413)'where(65,845)}-' ^@don't()?how()when()>><mul(591,832)where(600,755)]who()}do()!^-$what()from()select()'#mul(572,956)@#:what()from(),]mul(303,346) when()$$how()@%/#$mul(857,344)/what()where()mul(969,234)$!#when()>>&who()(mul(113,494)%where()why()when()mul(659,592)<why()!<}mul(429,162)[who()*>#(/'mul(72,670)when()^^mul(369,596)mul(631,168)-why()()[*}mul(330,968) $why()where()mul(230,139)don't()@)@<mul(849,413)-when(){*?]mul(821,9)mul(753,277)]{&when()%:mul(262,360)what()mul(65,276)don't()])who();where()$!,(-mul(952,221)+:/{where()where()mul(608,843)'>where())%}where()&,}mul(875,661)~don't()':why(){mul(793*:mul(399,702)!://select()@when()why()do()@mul(488,581{?{&<who(617,140)@how()mul(156,982)why()'&<where()*:{mul(452{-+$$*/mul(202,724)]#:#why()+??(#mul(607,2)@^mul(20,845)#{+#[/#~/mul(111,872)how()select()]<how())'how()mul(921,254)$:;/where() ~why()}?mul(558,122)@how()<<who()mul(992,319)what(734,450)[^mul(498,490)/mul(632,639)when()]from(){why()]$[who(664,268)mul(401,695]!>how()&select()!<'mul(912,311)why()! })@+}mul(128*mul(626,752)%mul(49,60)[,who()what()select()<what()mul(24,8)>)@@]*]why(937,788)from():mul(945,658)<]don't()where()how(515,644)@+'select()how()mul(369,665)/],<when(){( $how()mul(361,594)$select()&:{:$when()mul(52,806) #from()@when()where():>mul(263,185)where()^why()why()@what()mul(82,407)mul(464,537)[mul(871,333)^mul(560,227)-why()mul(966,203)$what()+where()#mul(101,21)}%how(),)^who()>,select()mul(667,565)('what(),%select()(@mul(500,204:''<~'why(477,559)<do()>)[where()mul(698,648);how(){&?what()^@[%mul(280,395)>~, mul-#/%:where()>where():mul(170,746)don't()}($:@mul(998,876)*~<[mul(121,366)-?#;how()>from() ::mul(804,883)^-[  (:mul(100,354who(544,766)+,]>!['/;mul(949,115)
+[^!})from()&mul(617,518)*how()(:@who()what()/mul(591,163):what()?{'do()!/when()!$mul(394,797)]how(620,741)!:!mul&%mul(523,862) ~}where()why()}from()! @do()mul(270,205)from()[&^mul(577,474)?{*/why()*what()mul(656,30)where()+#,@mul(295,616)why()/mul(8,267))-^when()who(610,661)'mul(182,139)select()}select()!when();;mul(492,992)?how()~($who(716,562)%/mul(702,654))*>mul(126,386)[mul(351,400)select()%$[!}{+mul(98,266)mul(924,5)*'(^:[}!?mul(112,163)+!?where()mul(987,791)mul(943,488)how()mul(698,312)&:@from(442,439)~%~:mul(235,520)%mul(248,221&>/;select()what()) ~@from()mul(546,261)'mul(956,953why(458,937)when()~!where();mul(442,916)%;)&(mul(410,237)where()~why()[+?[mul(169,337)what()who()&what()mul(901<where()#&who(808,156)-mul(322,634)>/mul* don't()mul(999,662)*]&/'#<+<select(621,69)do()>,^}'mul(365,260){{?,,}from(520,861)where()what()mul(325,208): when()+>{!;mul(335,726)#',:>@?mul(48,443![mul(130,626)!{</#%*select()mul(806,140)'']'~mul(697,649)&,+??[%?how()mul(515,385)mul(878,769)^when()&what()]:$)*%don't()#){/mul(119,439)-[,+!'don't()^<what()~^-[(-%mul(791,824)+>^don't()*?-*[%>mul(934,995),how()@from()'<mul(907,832)?% who()(*[do()%:where()what()>#mul(433,843)why()<}$}how()-mul(754,464)when()why()mul(992,113);]/{%mul(87,293^]how()why()~&when()*#mul(589,979)@-&select()/%mul(218,248);mul(536,581)when()mul(215,212)/%when(66,857)@what()+mul(958,271) '%#who()&{mul(239,197)}what()$>{*'select()mul(365,443)>why()how()what()%mul(885,496how()when()}{@/ mul(589,42)^:;who()where()why() !how()(mul(574,947)*;where():&where()%]<{mul(572,4)$mul(232,716)when()<?>when()mul(928,697)^(where()mul(301,501)-mul(100,436)#~?mul(708,770): @:@)!*mul(89,177)><where()]mul(699,985)(-)do()#who()mul(194,358)why():when()/why()where()mul(103,669)#mul(779,400)@when()~/;/({mul(760,763&-when()%]where()*#mul(781,829)*select()><@+ {when()+mul(926,998);>,)?,$)mul(813,382)}from(728,403)^mul(497,820)where()(?why(454,153)!select()}*!don't()what()from()}&}<?)([mul(379,305)!when(): don't() ~~why()@&%mul(953,224))![*)/mul(802,693):;mul(126,477)-when(409,550){mul(238,713)!/!why()-}+>?how()mul(432,895)$!+mul(743,149)$!why(704,998)when()mul(229,683)((when()from()#&{mul(217,869)^)?)?what() select()}mul(765,209)who():}%{mul(448,553)[:-,don't()what()<,}from()where())mul(543,719)from(415,153)why()!'?^~mul(666,540)mul(922,877)mul(416,636)+#;$select()'mul(971,485)from(964,539)where()^ *who()/mul(35,594)<:mul(207,585)~*}'<when()>[]#mul(815,776){?%&*@?mul(385,133)['!:who() )mul(439,846)&)mul(529;?>;#mul(677,906)^& ()mul(75])how())mul(481,206)who()why()$^ from();what()'why()do()(%^&)mul(277,454)>where()where()$-#select()+/don't()what()select()]mul(295,126)why();from()mul(203,301){#mul(572,420){%(-*mul(929,786)do()mul(107,813)mul(921,668)'^+++!:[;mul(587,921)mul(242,920)mul(933,463)why()mul(340,196)'--']-mul(623,675)select()what()mul(656,927)<$)from()where(473,933)]~mul(408,566)!>$mul(373,541)}%*^)mul(346,14)>&how()@^-(&;mul(993,735)select()*{mul(990,221)*from():[ mul(940,96)/how()^>#;select()/#?mul(624,249)>mul(160,974)]^mul(589,900)&$[?[<-!select()mul(512,717)^/&mul(226,478)* ';'+from()?@~mul(224,929)!when()^what()where()'@'>~mul(451,87)
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diff --git a/day03/main.rs b/day03/main.rs
new file mode 100644
index 0000000..d57da2d
--- /dev/null
+++ b/day03/main.rs
@@ -0,0 +1,107 @@
+#![feature(array_windows)]
+
+use regex_lite::Regex;
+
+pub const INPUT: &str = include_str!("./input.txt");
+
+type Input = &'static str;
+
+fn parse_input(input: &'static str) -> Input {
+    input
+}
+
+pub fn main() {
+    let input = parse_input(INPUT);
+    println!("Part 1: {}", part_1(&input));
+    println!("Part 2: {}", part_2(&input));
+}
+
+fn part_1(input: &Input) -> usize {
+    const PATTERN: &str = r"mul\((\d{1,3})\,(\d{1,3})\)";
+    let regex = Regex::new(PATTERN).expect("I fucked up the regex");
+    assert!(regex.is_match(INPUT));
+
+    let mut sum = 0;
+    for r#match in regex.captures_iter(input) {
+        let first = r#match
+            .get(1)
+            .expect("Missing first number")
+            .as_str()
+            .parse::<usize>()
+            .expect("Failed to parse first number:");
+        let second = r#match
+            .get(2)
+            .expect("Missing second number")
+            .as_str()
+            .parse::<usize>()
+            .expect("Failed to parse second number:");
+        sum += first * second;
+    }
+    sum
+}
+
+fn part_2(input: &Input) -> usize {
+    const PATTERN: &str = r"mul\((\d{1,3})\,(\d{1,3})\)|do\(\)|don't\(\)";
+    let regex = Regex::new(PATTERN).expect("I fucked up the regex");
+    assert!(regex.is_match(INPUT));
+
+    let mut sum = 0;
+    let mut enabled = true;
+    for r#match in regex.captures_iter(input) {
+        match r#match.get(0).unwrap().as_str() {
+            "do()" => enabled = true,
+            "don't()" => enabled = false,
+            _ if enabled => {
+                let first = r#match
+                    .get(1)
+                    .expect("Missing first number")
+                    .as_str()
+                    .parse::<usize>()
+                    .expect("Failed to parse first number:");
+                let second = r#match
+                    .get(2)
+                    .expect("Missing second number")
+                    .as_str()
+                    .parse::<usize>()
+                    .expect("Failed to parse second number:");
+                sum += first * second;
+            }
+            _ => {}
+        }
+    }
+    sum
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::parse_input;
+
+    const SAMPLE_INPUT_1: &str =
+        r#"xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"#;
+    const SAMPLE_INPUT_2: &str =
+        r#"xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))"#;
+
+    #[test]
+    fn test_part_1_with_sample_solution() {
+        let input = parse_input(SAMPLE_INPUT_1);
+        assert_eq!(super::part_1(&input), 161)
+    }
+
+    #[test]
+    fn test_part_1_with_solution() {
+        let input = parse_input(super::INPUT);
+        assert_eq!(super::part_1(&input), 173529487);
+    }
+
+    #[test]
+    fn test_part_2_with_sample_solution() {
+        let input = parse_input(SAMPLE_INPUT_2);
+        assert_eq!(super::part_2(&input), 48)
+    }
+
+    #[test]
+    fn test_part_2_with_solution() {
+        let input = parse_input(super::INPUT);
+        assert_eq!(super::part_2(&input), 99532691);
+    }
+}