diff --git a/2024/Cargo.lock b/2024/Cargo.lock
index 5d41a28..3a80814 100644
--- a/2024/Cargo.lock
+++ b/2024/Cargo.lock
@@ -2,6 +2,53 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "aoc2024"
 version = "0.1.0"
+dependencies = [
+ "regex",
+]
+
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
diff --git a/2024/Cargo.toml b/2024/Cargo.toml
index 3453c1c..e1f00d1 100644
--- a/2024/Cargo.toml
+++ b/2024/Cargo.toml
@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+regex = "1.11.1"
diff --git a/2024/input/02_input.example b/2024/input/02_input.example
new file mode 100644
index 0000000..b49c10d
--- /dev/null
+++ b/2024/input/02_input.example
@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9
diff --git a/2024/input/02_input.txt b/2024/input/02_input.txt
new file mode 100644
index 0000000..814097f
--- /dev/null
+++ b/2024/input/02_input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/input/03_input.txt b/2024/input/03_input.txt
new file mode 100644
index 0000000..ef794f2
--- /dev/null
+++ b/2024/input/03_input.txt
@@ -0,0 +1,6 @@
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+why(872,627)when() @who()&why()mul(585,812)-+#%(%)mul(774,83)where()<mul(895,861)mul(251,516);where()>-(/~mul(249,409)&>don't()('^mul(504,414)!%>%[#{*<%mul(188,200)mul(167,558)>?>select():@mul(56,920)-how()}[{?^*,mul(280,213how(298,460)/]<*mul(827,209)$^{where();mul(55,859)?mul(820,629)^],*@+!]&mul(51,796)*@[:mul(391,202)(*&($?%;{mul(715,516)where()when()when(878,620)>^%><()mul(200,147)##}^$ ]'select()+mul(830,239)((~select()'mul(107,50),:<{when()(select(441,699)when()mul(190,106)]what()+where()@{where()#who()mul(280,967)who();from()( do()+'] /;where()&select()/mul(196,704))<&mul(268,129)#)!'?+**mul(2,819)---{what()mul(340,265)]-;@}-{>mul(957,38)>@~>&@<<mul(135,648)~mul(544,906)-mul(406,769)who()from()*where(713,507))(do()'[*select()&<'who(784,971){$mul(520,472);from()mul(823,285)]?)%{}mul(412,741+&{mul(822,931)^'*'*why()where()&!mulwhen()%@;^from(){mul(432,703)+/when(331,316):&who(713,258)mul(763,674):}~:mul/!select()why()&]{who()}]who()mul(908,41)mul(209,528)^mul% %#@@how()mul(986,797)+];~>who()(how()'~mul(576,420)!]:(who()mul(696,352)what()*,{]how()<#mul(722,996*^>[mul(707,555)mul(690,368)+*#{why()/why()?;mul(191,355)-}mul(634select()from(662,490)^select(130,551)>$when()mul(785,141)how()from()@//^do()from()when()%mul(280,35)(select()who()<:who()#<-mul(656,404)&+&mul(876,651),<'>mul(932,833)where()(,when()when()!/mul(756,656)&where();-^why()]mul(247,388)where()}{why()}?do()$}why()select()mul(783,462) &],(who()?:;mul(981,136)<{];>mul(848,166),]-why()do()from(102,362):-~how() why()how()who()mul(163,237)%;]mul(762,71)~,<when()^) /mul:who()[>:-;mul(996,713)#!-~do()<mul(573,915))>/ ^^mul(190,532)&'why()@~mul(580,20)mul(512,144),how(712,274)# ([mul(74,589)>-what()what()~mul(144,880){mul(566,592), {@*why()mul(523,558)@)!mul(826,790)!select()why()from()(mul(110,522)!select()('mul(704,195>+from()?%>mul(274,353)))}who()[when(660,595)~how()]mul(552,121)from()select()why()mul(240,146)why()>   mul(679,332)why()(%(from()^:why(492,169)}~mul(799,127)%~}mul(755,381)[;%what()how())*when()what(323,755)?mul(454,719[-%/;why()how(316,859)^!when()mul(151,252)where()&<who()%mul(379,643)/!#]what()+*<[mul(495,86)%>/ &mul(802,262)**why()mul(860,835)<&]from()where(617,545);;mul(547,933)'mul(809,108)! ~%]})where()mul}'what():mul(270,513)who() (]@,~][mul(900,601)~:?!'mul(772,689)*(%'**~^from(){mul(664,414)&&-who();who()from()who()$,mul(658!*+mul(68,562)[*mul(227,260)^:#(;mul(171,823);>select()where()'+$$mul(520,111)>+*select()why()mul(713,530)}-<$;(;mul(94,879)?who()why()@/^/@mul(58,649)?why();(what(994,808)-:,mul(439,811)' mul(885,101)[what()mul(713,539)?/~where()!#/:#mul(119,763)where()select()[%;:from():+mul(78,791)select()}'mul(253,65)^ %mul(175,244)]#+why()where()@;mul(610,884)*;what()mul(70,112)( mul(375,253)mul(321,80);+mul(498,751)>[~?mul(848,622?$<how()':?']-what()mul(931,202)-@where()-$+$>mul(43,693)how(){(^<who()why()!*mul(696,319),when() ?,$mul(655,774)~who()mul(507,610)@^<]mul(303,538)[] what()what()!)?mul(699,30)$;}{who()(+when();mul(100,158)>mul(91[)why()^:^from()]*mul(773,980);how()@who()(mul(817,36)
+!']*;&mul(832,66)[when()'^mul(839,760){ what()mul(374,389)-^*when()what()mul(743,565)+%where(24,265)--@mul(37,414)mul(200,132)&<&@when()who()]~what()mul(816,483))from()%{:mul(237,407)]what()select()where()mul(937,582)why())!)mul(196,261)>*<%;who()<:!mul(42,391)) where(711,384)mul(286from()'[%mul(112,582)from();:mul(755,219)!**where()<#?)mul(893,667)who()> #mul[:where()select()<mul(969,985){{mulfrom()#>>(/from()>:-mul(587,565)mul(979,685)mul(686,145)who()?;]:{$mul(815,666'?&mul(981,191)mul(710,249)~@what():*&+from()<mul(581,50)from() #$(; #;mul(299,214)when()%&where()/(&mul(982,443select()*?%>&mul(420,352)&(-mul(308,752)@'mul(408,712)why()<]mul(610,709)~{mul(495,81)~),select()^mul(257,534)where()}mul(154,658)^}mul(313,894)(why()mul(950,201)>why()%what(276,768)%-+??(mul(578,595)mul(860,931)&{>:)^mul(566,551)>what()+how()[*from()[)mul(879,564)from()~:^'}[select()#who()do()%what();who()#mul(614,173))>'mul(274,742)why()+!&*/mul(962,316)?do()<@mul(599,386))mul(355,316)+-;&where()-;don't()?#[]#where()[::mul(532,56)>~@mul(264,327)~?%]&@! when()+mul(739,388)<$*)what()mul(732,804)from()who()'who()#,~mul(642,712)?}?mul(362,448)&,}+}: -mul(980,701)']when()-;]^^mul(761,19)+,mul(69,535)$>@<mul(901,942)who()when()^how()when()mul(424,524)-why())select(934,173)what()}/where()>do()%/:mul(244,738) mul(836,850):;when()from()'?do()]who(931,224)+}*@when(690,226)how()!mul(651,163)?how()-(&$-@mul(159,702)@mul(165,723)}(mul(401,331)'what() what(75,87)){,mul(665,944)/<:@'why(290,555)&%';mul(906,18)select()mul(394,692)*where()'mul(127,395){^what()~-^mul(892,931)%@who()<!/!(mul(900,441)']:(~$%,from()$mul(128,485))^+]what()do())&from()}'?%-from()how()mul(72,571)]+:~where()^&/$ mul(265,657);why()mul(420,896)':$@~ +<?mul(738,771)*~mul(769,630)select(202,447)];mul(64,143),(mul(820,863)}[]:)<[from()mul(913,277)<;+;@[*!/mul(339,478)mul(533,783)^mul(925,371)@@what()]mul(554,646)]{do()--where(),}mul(869,832)?::-<>mul(770,492)when()mul(615,744)<;+]+how()}&(mul(849,515)who(651,542)/@$mul(551,298)mul(752,737)>?what();^{,mul(518,320)~select()(+-,>;)~mul(37,708)why()'mul(213,584) how()mul(552,286)mul(41,894) <(mul(410,393)(why(),^<(#{~+don't()what()/when()what(35,148)$how()  $'mul(352,31)'!?[mul(922,598)# mul(274,543)/{/'!-()mul(899,396))&-,#select()how()select(963,44)mul(719,545)(')mul(909,800)-[-mul(718,282);< )where();*#+mul(509,20)>?@^select() $do()]:what()>}!!^({mul(492,556);<{$how()mul(98,348){]'don't(){{',mul(564,736)>{how()'mul(154,829)'~from()]do(){mul(452,695)+where()who(),-mul(906,99){} >why()why()mul(12,879)~when(646,247) ;mul(878,782)+ '{+&>who() mul(726,701)%<##!mul(457,189)$>')+~!%do()where() @when()mul(159,260)<%[~when() why()mul(663,679)}/
diff --git a/2024/src/day03.rs b/2024/src/day03.rs
new file mode 100644
index 0000000..f919338
--- /dev/null
+++ b/2024/src/day03.rs
@@ -0,0 +1,65 @@
+use std::fs::read_to_string;
+
+use regex::Regex;
+
+pub fn stage1(input: &str) -> usize {
+    let r = Regex::new(r"mul\((\d*),(\d*)\)").unwrap();
+    read_to_string(input)
+        .unwrap()
+        .lines()
+        .map(|line| {
+            r.captures_iter(line)
+                .map(|c| {
+                    let x: usize = c[1].parse().unwrap();
+                    let y: usize = c[2].parse().unwrap();
+                    x * y
+                })
+                .collect::<Vec<usize>>()
+        })
+        .flatten()
+        .sum()
+}
+
+pub fn stage2(input: &str) -> usize {
+    let r = Regex::new(r"(mul\((\d*),(\d*)\))|(don't\(\))|(do\(\))").unwrap();
+    let mut state = true;
+    read_to_string(input)
+        .unwrap()
+        .lines()
+        .map(|line| {
+            r.captures_iter(line)
+                .map(|c| {
+                    if c[0].starts_with("mul") && state {
+                        let x: usize = c[2].parse().unwrap();
+                        let y: usize = c[3].parse().unwrap();
+                        return x * y;
+                    }
+                    if c[0].starts_with("don't()") {
+                        state = false;
+                    }
+                    if c[0].starts_with("do()") {
+                        state = true;
+                    }
+
+                    0
+                })
+                .collect::<Vec<usize>>()
+        })
+        .flatten()
+        .sum()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_stage1() {
+        assert_eq!(stage1("input/03_input.txt"), 165225049);
+    }
+
+    #[test]
+    fn test_stage2() {
+        assert_eq!(stage2("input/03_input.txt"), 108830766);
+    }
+}
diff --git a/2024/src/lib.rs b/2024/src/lib.rs
index bc52e1c..cb38436 100644
--- a/2024/src/lib.rs
+++ b/2024/src/lib.rs
@@ -1,3 +1,4 @@
 #[allow(dead_code)]
 mod day01;
 mod day02;
+mod day03;