diff --git a/day_03/program.py b/day_03/program.py
index e990273..bd5f517 100755
--- a/day_03/program.py
+++ b/day_03/program.py
@@ -12,8 +12,9 @@ def get_lines(filename: str) -> list:
 
 def part1_get_result_sum(lines: list) -> int:
     result_sum = 0
+    pattern = re.compile(r"mul\((\d+),(\d+)\)")
     for line in lines:
-        matches = re.findall(r"mul\((\d+),(\d+)\)", line)
+        matches = re.findall(pattern, line)
         for match in matches:
             result_sum += int(match[0]) * int(match[1])
     return result_sum