diff --git a/Chapter 12/Exercise 12.1 b/Chapter 12/Exercise 12.1
new file mode 100644
index 0000000..b9cbed7
--- /dev/null
+++ b/Chapter 12/Exercise 12.1	
@@ -0,0 +1,35 @@
+<!doctype html>
+<html>
+
+<head>
+    <title>Complete JavaScript Course</title>
+</head>
+
+<body>
+    <div id="output">Complete JavaScript Course</div>
+    Search for:
+    <input id="sText" type="text">
+    <br> Replace with:
+    <input id="rText" type="text">
+    <br>
+    <button>Replace</button>
+    <script>
+        const output = document.getElementById("output")
+        const findValue = document.getElementById("sText");
+        const replaceValue = document.getElementById("rText");
+        document.querySelector("button").addEventListener("click", lookUp);
+
+        function lookUp() {
+            const s = output.textContent;
+            const rt = replaceValue.value;
+            const re = new RegExp(findValue.value, "gi");
+            if (s.match(re)) {
+                let newValue = s.replace(re, rt);
+                output.textContent = newValue;
+            }
+        }
+    </script>
+
+</body>
+
+</html>
