diff --git a/2023/day01.rb b/2023/day01.rb
new file mode 100644
index 0000000..95a7b90
--- /dev/null
+++ b/2023/day01.rb
@@ -0,0 +1,25 @@
+lines = STDIN.read.split("\n")
+
+puts (
+  lines.map do |l|
+    digits = l.scan(/\d/).flatten
+    (digits.first + digits.last).to_i
+  end.sum
+)
+DIGIT_MAP = {
+  'one' => '1',
+  'two' => '2',
+  'three' => '3',
+  'four' => '4',
+  'five' => '5',
+  'six' => '6',
+  'seven' => '7',
+  'eight' => '8',
+  'nine' => '9'
+}
+puts (
+  lines.map do |l|
+    digits = l.scan(/(?=(one|two|three|four|five|six|seven|eight|nine|\d))/).flatten
+    [digits.first, digits.last].map { |d| DIGIT_MAP[d] || d }.join.to_i
+  end.sum
+)
diff --git a/2023/examples/day01.txt b/2023/examples/day01.txt
new file mode 100644
index 0000000..33f7317
--- /dev/null
+++ b/2023/examples/day01.txt
@@ -0,0 +1,7 @@
+two11nine
+eightwo11three
+abcone22threexyz
+xtwone33four
+4nineeightseven2
+zoneight234
+7pqr3stsixteen