diff --git a/Cargo.toml b/Cargo.toml
index 8652bc0..1f9144d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+regex = "1"
diff --git a/inputs/02-01.txt b/inputs/02-01.txt
new file mode 100644
index 0000000..f88b67e
--- /dev/null
+++ b/inputs/02-01.txt
@@ -0,0 +1,1000 @@
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+1-4 c: dctcc
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+8-16 h: lhlghlcbqgsmjhbh
+8-9 x: xxxxxxxxx
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+4-5 j: jvjpjj
+1-2 d: bmhdpdr
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+7-10 p: mpppppprpmjs
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+1-4 r: mrwbr
+4-6 m: knhmnm
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+11-13 r: rrrrprrrrrzrr
+7-11 z: zzzzzzjzzzzz
+17-19 d: ddddddddddddddddjdd
+4-5 c: ccncdc
+4-6 x: gxxvqx
+2-3 g: ggpg
+6-11 m: blgvnmbxhpmxmb
+2-15 w: wvdwwfqjwqwvmfrzw
+3-4 s: ssdw
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+16-17 l: lllplllllllllllllnl
+2-4 h: qtwhwz
+5-7 v: xvvwfvfvv
+4-10 k: kkkkkkkkqkkk
+5-6 f: qzvvpf
+4-11 d: whhddttshzds
+10-13 q: qjlqqqqqpwqqgqq
+11-12 w: nwwwdmvwwwwk
+4-8 l: rlljllhljl
+7-10 s: sssssssssd
+2-8 c: qcgrtxrfccgc
+7-8 n: pnnngnnnvnwdnn
+8-10 c: cscckctxcrhgc
+1-4 n: ngnncrnn
+6-12 t: ztzqttbmtztpsnrnt
+8-12 b: bbbbbbbbbbbb
+1-4 z: czzzzzzz
+1-2 k: kktmkf
+10-14 x: xxxjsxxnxxxxxqxxpx
+11-15 v: vxvvrvvvdvvvvvbv
+7-9 s: nsslmtsdxbxfsfssswfx
+12-15 l: lllllllllllfcltllll
+6-7 q: qqqqtqdqq
+15-19 n: nnnnnnnnnnnnnnbnnnn
+6-8 s: ssttshsks
+16-20 r: rrrrprrrjrlqrrsrrrrb
+7-10 q: qqqqqqqqqq
+3-4 w: wcbw
+5-6 g: tcggrxgrgvl
+10-12 l: kllswlmlglps
+4-7 v: qkvvvvqxjktkvvvjv
+5-13 r: rrrrqrrrrrrrrrr
+1-2 n: nnnnmb
+1-8 x: xktqbxgkkjwlt
+3-4 k: kskk
+16-17 k: kkdkkkkkkkkkkkkwk
+10-15 n: vnnnnnnnnqjnnknnnr
+8-15 m: mfmmgmmqmmmmmkmmmmmm
+4-8 k: kkkgkkkjkkk
+16-17 h: hhhhhhhhhhhlhhhqh
+1-4 p: ppprpppppp
+1-9 g: gbdxggmggrgw
+1-5 f: vfffff
+2-12 d: jzvwdmsqpdnh
+12-13 w: wwcwgzwwwwwhwwwwww
+9-10 z: zzdzzlzvgzzztzzz
+4-5 f: ffftff
+8-14 x: xxxxxxxrxxxxxx
+1-4 r: kgrrvrrvrr
+3-4 w: zkpwxkk
+2-5 k: tkckkfcvxkxk
+3-9 r: rbrrrrgrrrrkbrrr
+3-4 t: ttxx
+8-11 z: zzzzzzzzzzz
+6-10 p: pnwhxpmxpfskq
+1-16 d: dddddddddddddddgdddd
+1-7 c: kctcccg
+1-5 q: sqqqrqqq
+14-16 f: fjfffffqfkfffjffff
+3-8 v: knvrrqvtv
+1-2 p: ptgswlvpdnmr
+3-5 v: vvkmnvdwk
+10-14 r: rrrrrrrrrhlrwrrrd
+2-11 f: xffffxjfffzfffpf
+1-5 p: nppppppp
+15-16 x: xxxxxxxxxxxxxxsx
+15-16 b: prhbmdvwcmtzpvbb
+11-14 t: rngdttnzqtjtcttdvbmt
+8-10 f: ffvldffqfqffgf
+1-3 r: rzqrmz
+7-8 n: tntnnnntn
+6-14 s: qpvlfbsgswsnwsmpz
+9-12 t: tvwstttttttktwt
+4-6 g: vslqbgg
+9-16 d: dsdddddddrdddddhdbdd
diff --git a/src/lib.rs b/src/lib.rs
index d158675..31d5b33 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,11 +1,13 @@
-
+use std::fs;
 use std::fs::File;
-use std::io::{prelude::*, BufReader, Error};
+use std::io::{prelude::*, BufReader};
+use std::error::Error;
+use regex::Regex;
 
 
 
-pub fn aoc_01_01(filename: &str) -> Result<(), Error> {
 
+pub fn aoc_01_both(filename: &str) -> Result<(), Box<dyn Error>> {
     let file = File::open(filename).expect("No file");
     let br = BufReader::new(file);
     let mut v: Vec<i64> = vec![];
@@ -35,5 +37,54 @@ pub fn aoc_01_01(filename: &str) -> Result<(), Error> {
     }
 
     return Ok(());
+}
 
+pub fn aoc_02(filename: &str) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(filename)?;
+
+
+    let pairs: Vec<Vec<String>> = contents.lines().map(|line| {
+        line.split(":").map(|s| String::from(s)).collect()
+    }).collect();
+
+    aoc_02_01(&pairs).unwrap();
+    aoc_02_02(&pairs).unwrap();
+    Ok(())
+}
+
+fn aoc_02_01(pairs: &Vec<Vec<String>>) -> Result<(), Box<dyn Error>> {
+    let mut valid = 0;
+    let rules_re = Regex::new(r"(\d*)-(\d*) ([a-z])").unwrap();
+    for i in 0..pairs.len() {
+        let rule = rules_re.captures(&pairs[i][0]).unwrap();
+        let min = rule[1].parse::<usize>().unwrap();
+        let max = rule[2].parse::<usize>().unwrap();
+        let matches: usize = pairs[i][1].matches(&rule[3]).count();
+        if matches >= min && matches <= max {
+            valid += 1;
+        }
+    }
+
+    println!("2_1 had {}/{} valid passwords", valid, pairs.len());
+    return Ok(());
+}
+
+fn aoc_02_02(pairs: &Vec<Vec<String>>) -> Result<(), Box<dyn Error>> {
+    let mut valid = 0;
+    let rules_re = Regex::new(r"(\d*)-(\d*) ([a-z])").unwrap();
+    for i in 0..pairs.len() {
+        let rule = rules_re.captures(&pairs[i][0]).unwrap();
+        let first = rule[1].parse::<usize>().unwrap();
+        let sec = rule[2].parse::<usize>().unwrap();
+
+        let m1 = pairs[i][1].as_bytes()[first] == rule[3].as_bytes()[0];
+        let m2 = pairs[i][1].as_bytes()[sec] == rule[3].as_bytes()[0];
+        if (m1 || m2) && !(m1 && m2) {
+            valid += 1;
+        }
+
+    }
+
+    println!("2_2 had {}/{} valid passwords", valid, pairs.len());
+    return Ok(());
 }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index f37a13e..bd03963 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,20 @@
-
-
+use std::env;
 
 fn main() {
-    //let filename = env::args().nth(1).expect("input filename required");
+    let day = match env::args().nth(1) {
+        Some(arg) => arg.parse().unwrap(),
+        None => 1
+    };
+
+    let result = match day {
+        1 => advent_of_code::aoc_01_both("./inputs/01-01.txt"),
+        2 => advent_of_code::aoc_02("./inputs/02-01.txt"),
+        _ => Err(format!("unsupported day {}", day).into()),
+    };
+
+    match result {
+        Ok(_) => (),
+        Err(e) => println!("Error executing day {}: {}", day, e),
+    }
 
-    advent_of_code::aoc_01_01("./inputs/01-01.txt");
 }