solve day 3 part 2

day_03/program.py

@@ -10,17 +10,38 @@ def get_lines(filename: str) -> list:
         return [line.strip() for line in file.readlines()]
 
 
-def main():
-    # lines = get_lines("sample-input.txt")
-    lines = get_lines("input.txt")
-
+def part1_get_result_sum(lines: list) -> int:
     result_sum = 0
     for line in lines:
         matches = re.findall(r"mul\((\d+),(\d+)\)", line)
         for match in matches:
             result_sum += int(match[0]) * int(match[1])
+    return result_sum
 
-    print("Part 1: The sum of the results is", result_sum)
+
+def part2_get_result_sum(lines: list) -> int:
+    result_sum = 0
+    active = True
+    pattern = re.compile(r"mul\((\d{1,3}),(\d{1,3})$")
+    for line in lines:
+        chunks = line.split(")")
+        for chunk in chunks:
+            if active:
+                if chunk.endswith("don't("):
+                    active = False
+                elif match := re.search(pattern, chunk):
+                    result_sum += int(match.group(1)) * int(match.group(2))
+            elif chunk.endswith("do("):
+                active = True
+    return result_sum
+
+
+def main():
+    # lines = get_lines("sample-input.txt")
+    lines = get_lines("input.txt")
+
+    print("Part 1: The sum of the results is", part1_get_result_sum(lines))
+    print("Part 2: The sum of the results is", part2_get_result_sum(lines))
 
 
 if __name__ == '__main__':

day_03/sample-input.txt

@@ -1 +1 @@
-xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
+xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))