add day 8 through 10

day08/src/main.rs

@@ -0,0 +1,49 @@
+use regex::Regex;
+
+fn main() {
+    let content = std::fs::read_to_string("input.txt").unwrap();
+    let data: Vec<_> = content.lines().collect();
+
+    part1(&data);
+    part2(&data);
+}
+
+fn part2(data: &[&str]) {
+    let mut new_length = 0;
+    let mut old_length = 0;
+
+    let re_quote = Regex::new("\"").unwrap();
+    let re_backslash = Regex::new(r"\\").unwrap();
+
+    for line in data {
+        old_length += line.len();
+        let found = re_quote.replace_all(line, "AA");
+        let found = re_backslash.replace_all(found.as_ref(), "BB");
+
+        new_length += found.len() + 2; // add first and last quote
+    }
+    let result = new_length - old_length;
+    println!("{result}");
+}
+
+fn part1(data: &[&str]) {
+    let mut literal_length = 0;
+    let mut memory_length = 0;
+
+    let re_hex = Regex::new(r"\\x[a-f0-9]{2}").unwrap();
+    let re_backslash = Regex::new(r"\\\\").unwrap();
+    let re_doublequote = Regex::new(r"\x5c\x22").unwrap();
+
+    for line in data {
+        literal_length += line.len();
+        let found = re_hex.replace_all(line, "A");
+        let found = re_backslash.replace_all(found.as_ref(), "B");
+        let found = re_doublequote.replace_all(found.as_ref(), "C");
+
+        memory_length += found.len() - 2; // remove first and last quote
+    }
+    let result = literal_length - memory_length;
+    println!("{result}");
+}
+
+// https://adventofcode.com/2015/day/8