diff --git a/2024/ruby/day_03.rb b/2024/ruby/day_03.rb
new file mode 100644
index 0000000..d307b67
--- /dev/null
+++ b/2024/ruby/day_03.rb
@@ -0,0 +1,9 @@
+input = DATA.read
+  .gsub(/don't\(\)(?~do\(\))do\(\)/, "")  # part two
+  .scan(/mul\((\d+),(\d+)\)/)
+  .map { _1.map(&:to_i) }
+
+pp input.sum { _1 * _2 }
+
+__END__
+xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))