diff --git a/README.md b/README.md
index c959c63..e7e95be 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,4 @@ Below are a list of the programming languages used to solve each day:
 
 - Day 1 - Haskell
 - Day 2 - Haskell
+- Day 3 - Rust
diff --git a/day3/Cargo.lock b/day3/Cargo.lock
new file mode 100644
index 0000000..4104d70
--- /dev/null
+++ b/day3/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day3"
+version = "0.1.0"
diff --git a/day3/Cargo.toml b/day3/Cargo.toml
new file mode 100644
index 0000000..6b20f5c
--- /dev/null
+++ b/day3/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day3"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/day3/README.md b/day3/README.md
new file mode 100644
index 0000000..2b5cb36
--- /dev/null
+++ b/day3/README.md
@@ -0,0 +1,17 @@
+# Day 3
+
+## Instructions
+
+From the root directory of the crate (where this README is) just execute:
+
+```
+cargo run
+```
+
+The solution will be printed to the terminal output.
+
+## Notes:
+
+Back to Rust since I didn't have as much time today to mess around with Haskell.
+Although Haskell has been slightly interesting, it's nice to be back in more familiar territory.
+
diff --git a/day3/input.txt b/day3/input.txt
new file mode 100644
index 0000000..4c5bfd9
--- /dev/null
+++ b/day3/input.txt
@@ -0,0 +1,7 @@
+!how()where()*mul(527,340)?why()^?mul(168,100)!^#mul(390,111)>'when()'select())((from()how()mul(412,526)/@what()from()when()-mul(500,980)#&[}]mul(887,503)%,$mul(699,805)what()select())>mul(292,305),'-{,@,how()who()mul(213,633)when()?@who()mul(652,4)*&'what()mul(177,237)&who()why()(@{+;why()<mul(23,321)what()when();from()-do()who() {&}-:(mul(844,162)~from()/mul(77,769)%,how()@%(?who()]<mul(694,833)^from()how()> &mul(193,679),)&mul(565,339)?}what()!who(){mul(705,313)mul(294,50)+mul(201,534) )~how()mul(659,49)!mul(871,788)select()where()from()mul(346,618) *&@'why()&}#mul(483,765)!#select()^*+[what()when()mul(448,525)]>:where()&^who()&mul(611,331):!)*/]}mul(37,42)>mul(538,106)when()why()mul(36,120)~where()-{+from()$'mul(950,456))mul(28,237)what()when(479,124)mul(697,976)):**/]&#how()#mul(424,841)why()'!;~mul(108,859)~%{?!mul(40,521)do()[^when()/%$+ [where()mul(187,953)who()where()select()(select()what()mul(984,77)<@)(/where()from()~;mul(163,398)/who()who()~mul(445,94))what()what()][how(),mul(115,245)--}/#how()what()!mul(366,981)'$why()do()what(565,96)who()mul(128,999):mul(858,772)[,,mul(796,864)why()what()^(mul(136,980)when()?!when()}mul(142,552)(mul(354,328)[(@how() (/~#mul(159,715)where()&mul(567,560)from()$^'$&&+!when()mul(582,489);where();select(),mul(306,841)? ,)how()mul(274,549)@~what()~?*mul(448,441);&<'select()when()when()#select()from()mul(404,209)^/ @who()who()'mul(400,15)';^&&when():{mul(199,543)[from()~+mul(452,787)([select()>/]$!/mul(840,165)when()>^why()~>when()(mul(830,125)from():mul(433,238);%why(){';$mul(494,781),-mul(139,401)&&&+who()>/^select()]do()mul(116,181)+$*[:who() do()how()<what()+mul(392,879)()what()don't()~)&?#*}mul(909,275)mul(695,234):],from()++^how()>;mul(514,117)$who()*)~%mul(859,857)}mul(837,844)>{@-what())-@@mul(574,73)]<[[why(608,495)how()who()when()mul(937,176)(%mul(471,325){'+)?:}mul(695,347)mul(56,888)where()##;#>who()+mul(157,650)mul(847,72):,[(how(144,703):mul(294,627)})>@mul(74,230)@)+what()mulhow()><<,$!(;why()mul(635,532)-select()mul(171,737)?select()[why()&^mul(587,686)$how()from())when()>;where()&mul(600,336)}@&{mul(651,690)from()?->&%mul(454,745)mul(387,378)mul(142,934)]mul(820,891)@#why()&how();;why()mul(337,723)&]from()when(894,39) ,>( mul/%(mul(271,558)#}']what()$-<^(mul(234 [what()when()select()($)+!don't()/ %<?%!]^mul(752,478)]how()mul(719,540)'when() why():(&'from(59,581)~mul(921,696)who()@,**%from(918,170))mul(224,391),where(104,159)do()from(339,837)}<<where()?{&how()mul(329,298)<who()what(937,474)&]@?mul(920,516);mul(438,991);{why()!]~'from()>mul(927,106)why()<%{{&~'<from()mul(950,746)'mul(240,649)?what(827,689)(mul(750,353)select(720,6)^mul(663,218)<,(why()<who()^>%why()mul(617?from()select()<what()mul(873,278)&^where(86,235)mul(170,108)!select()mul(66,5)@$^,~%from()mul(785,826): ~who(){mul(383,166):!![:~}+-'mul(554,291)@^)(^#when()when()why()mul(330,699)[:how(888,93)who()how(863,345)who()mul{how()-why()who()]$^mul(512,474)^@:mul(728,970)%mul(779,946)&& mul(216,667) where()^'%mul(788,642)how()>from()}$mul(915,977)& &mul(477,287){# mul(798,930)]mul(111select()*^@@/what()mul(518,86):('({&~{why()mul(991,855)*%^who()who()$/:{$mul(827,700)-'(mul(377,585)#&mul(171,537)when()@/>{< ,*:mul(349,478)!&^{-/mul(448,750)mul(868,546)mul(893,203)
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+
diff --git a/day3/src/lib.rs b/day3/src/lib.rs
new file mode 100644
index 0000000..9061d6d
--- /dev/null
+++ b/day3/src/lib.rs
@@ -0,0 +1,164 @@
+use std::{error::Error, fmt::Display, fs::read_to_string};
+
+/// Basic error type
+#[derive(Debug)]
+enum ParsingError {
+    EmptyInstructions,
+    ParserFailure,
+}
+
+impl Display for ParsingError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ParsingError::EmptyInstructions => write!(f, "No instructions present to process"),
+            ParsingError::ParserFailure => write!(f, "Failed to parse segment"),
+        }
+    }
+}
+
+impl Error for ParsingError {}
+
+/// Main execution function to analyze memory for uncorrupted mul commands
+pub fn analyze_memory(file_path: &str) -> Result<(), Box<dyn Error>> {
+    let instructions = read_to_string(file_path)?;
+    let part1_sol = process_mul_instructions(&instructions)?;
+    println!("Solution to part1 is \n{part1_sol}");
+
+    let part2_sol = process_do_dont_instructions(&instructions)?;
+    println!("Solution to part2 is \n{part2_sol}");
+
+    Ok(())
+}
+
+///Process mul instructions
+pub fn process_mul_instructions(instructions: &str) -> Result<i32, Box<dyn Error>> {
+    let segments = segment_instructions(instructions, 'm')?;
+    Ok(segments
+        .iter()
+        .map(|segment| calculate_segment_value(segment).unwrap_or(0))
+        .sum::<i32>())
+}
+/// Execution code for solving part 2 of the problem
+pub fn process_do_dont_instructions(instructions: &str) -> Result<i32, Box<dyn Error>> {
+    let segments = segment_instructions(instructions, 'd')?;
+    let mut last_was_do = true;
+    let mut sum = 0;
+    for segment in segments.iter() {
+        if segment.starts_with("don't()") {
+            last_was_do = false;
+        } else if segment.starts_with("do()") {
+            last_was_do = true;
+            sum += process_mul_instructions(segment).unwrap_or(0);
+        } else if last_was_do {
+            sum += process_mul_instructions(segment).unwrap_or(0);
+        }
+    }
+    Ok(sum)
+}
+
+/// Break up the total memory into separated strings for further processing
+pub fn segment_instructions(
+    instructions: &str,
+    filter_char: char,
+) -> Result<Vec<String>, Box<dyn Error>> {
+    let char_indices: Vec<usize> = instructions
+        .chars()
+        .enumerate()
+        .filter_map(|(i, char)| if char == filter_char { Some(i) } else { None })
+        .collect();
+
+    // Include the first chunk by default
+    let mut chunks: Vec<String> = [0]
+        .iter()
+        .chain(char_indices.iter())
+        .zip(char_indices.iter())
+        .map(|(idx1, idx2)| {
+            String::from_utf8_lossy(&instructions.as_bytes()[*idx1..*idx2]).to_string()
+        })
+        .collect();
+
+    chunks.push(
+        String::from_utf8_lossy(
+            &instructions.as_bytes()
+                [*char_indices.last().ok_or(ParsingError::EmptyInstructions)?..],
+        )
+        .to_string(),
+    );
+    Ok(chunks)
+}
+
+/// Analyze each segment to see if it's valid, if it is valid then return the value of the
+/// multiplication. If it isn't valid we return an error.
+/// We could use Regex here but I wanted to try a more manual approach to keep with the spirit of
+/// minimizing external libraries
+pub fn calculate_segment_value(segment: &str) -> Result<i32, Box<dyn Error>> {
+    // Verify string starts correctly
+    if !segment.starts_with("mul(") {
+        Err(Box::new(ParsingError::ParserFailure))
+    } else {
+        let mut segment = segment.to_owned();
+        segment.drain(..4);
+        let comma_split: Vec<&str> = segment.split(",").collect();
+        let parens_split: Vec<&str> = comma_split
+            .get(1)
+            .ok_or(ParsingError::ParserFailure)?
+            .split(")")
+            .collect();
+
+        if parens_split.len() < 2 {
+            return Err(Box::new(ParsingError::ParserFailure));
+        };
+
+        if let (Ok(left), Ok(right)) = (
+            comma_split[0].parse::<i32>(),
+            parens_split[0].parse::<i32>(),
+        ) {
+            Ok(left * right)
+        } else {
+            Err(Box::new(ParsingError::ParserFailure))
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    pub fn test_segmentation() {
+        let test_string = "lkjqermulemtymart";
+        let segments = segment_instructions(test_string, 'm').unwrap();
+        assert_eq!(segments[0], "lkjqer");
+        assert_eq!(segments[1], "mule");
+        assert_eq!(segments[2], "mty");
+        assert_eq!(segments[3], "mart");
+    }
+
+    #[test]
+    pub fn test_segment_value() {
+        assert_eq!(
+            calculate_segment_value("mul(10,14)aeqejrqlkd9()").unwrap(),
+            140
+        );
+        assert_eq!(
+            calculate_segment_value("mul(1a0,14)aeqejrqlkd9()").unwrap_or(0),
+            0
+        );
+        assert_eq!(
+            calculate_segment_value("mul(10,14aeqejrqlkd9()").unwrap_or(0),
+            0
+        );
+
+        assert_eq!(
+            calculate_segment_value("mul(910,54,don't(),#^+{").unwrap_or(0),
+            0
+        );
+    }
+
+    #[test]
+    pub fn test_do_dont() {
+        let instructions =
+            "mul(1,2)don't()mul(2,3)ekjkldomul(2,3)do()mul(211,adf2),))),)do()mul(211,12)";
+        assert_eq!(process_do_dont_instructions(instructions).unwrap(), 2534);
+    }
+}
diff --git a/day3/src/main.rs b/day3/src/main.rs
new file mode 100644
index 0000000..24a82db
--- /dev/null
+++ b/day3/src/main.rs
@@ -0,0 +1,7 @@
+use day3::analyze_memory;
+
+fn main() {
+    if let Err(err) = analyze_memory("input.txt") {
+        println!("Failed to analyze memory because of {err}");
+    }
+}