diff --git a/validation/composer.json b/validation/composer.json
new file mode 100644
index 0000000..084c369
--- /dev/null
+++ b/validation/composer.json
@@ -0,0 +1,10 @@
+{
+    "name": "violet/validation",
+    "type": "project",
+    "autoload": {
+        "psr-4": {
+            "Violet\\Validation\\": "src/"
+        }
+    },
+    "require": {}
+}
diff --git a/validation/css/.gitkeep b/validation/css/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/validation/css/styles.css b/validation/css/styles.css
new file mode 100644
index 0000000..5b5bb35
--- /dev/null
+++ b/validation/css/styles.css
@@ -0,0 +1,109 @@
+* {
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  /* Positioning */
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+
+  /* Styling */
+  background-color: #bbedbe;
+}
+
+h1 {
+  /* Positioning */
+  width: 80%;
+  padding: 2vw;
+
+  /* Font */
+  font-size: 8vw;
+  text-align: center;
+}
+
+h3 {
+  font-size: 4vw;
+}
+
+h1,
+h3,
+p,
+input {
+  color: #0e3610;
+}
+
+form {
+  width: 60%;
+  padding: 2.5vw 5vw 2.5vw 5vw;
+
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+}
+
+.row {
+  width: 100%;
+  display: flex;
+  flex-direction: row;
+  justify-content: center;
+  align-items: center;
+}
+
+input {
+  /* Input Shape */
+  width: 50%;
+  padding: 1vw;
+  margin: 1vw;
+  border: none;
+  border-radius: 18px;
+
+  /* Styling */
+  background-color: #f1fbf2;
+
+  /* Font */
+  font-size: 1vw;
+  font-weight: 400;
+}
+
+button {
+  /* Button Shape */
+  width: 40%;
+  padding: 1vw;
+  margin: 1vw;
+  border: none;
+  border-radius: 18px;
+
+  /* Font */
+  color: white;
+  font-size: 1vw;
+  font-weight: 600;
+
+  /* Transition for hover */
+  transition-duration: 500ms;
+
+  background-color: #1c6b20;
+}
+
+.card {
+  padding: 2vw;
+  background-color: gray;
+  border-radius: 18px;
+}
+
+.error {
+  color: white;
+  background-color: red;
+}
+
+.success {
+  color: white;
+  background-color: #0e3610;
+}
+
+.reset {
+  background-color: red;
+}
diff --git a/validation/img/.gitkeep b/validation/img/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/validation/img/success.jpg b/validation/img/success.jpg
new file mode 100644
index 0000000..bb20880
Binary files /dev/null and b/validation/img/success.jpg differ
diff --git a/validation/index.php b/validation/index.php
new file mode 100644
index 0000000..e7dd51c
--- /dev/null
+++ b/validation/index.php
@@ -0,0 +1,40 @@
+<?php
+$error = '';
+if (isset($_GET['error']))
+    $error = $_GET['error'];
+?>
+
+<!doctype html>
+<html lang="en">
+
+<head>
+  <title>Validation</title>
+  <link href="css/styles.css" type="text/css" rel="stylesheet">
+  <script src="js/index.js"></script>
+</head>
+
+<body>
+  <h1>Validation Assignment</h1>
+
+  <form action="process.php" method="post">
+    <input name="phone_number" type="text" placeholder="(xxx)xxx-xxxx" <?php $error ? 'value="' . $error . '"' : '' ?>>
+    <div class="row">
+      <button>Submit</button>
+      <button type="reset" class="reset">Reset</button>
+    </div>
+  </form>
+
+  <?php
+if ($error) {
+    echo '
+      <div class="card error">
+        <h3 class="error">Invalid Format</h3>
+        <p class="error">You entered: ' . $error . '</p>
+        <p class="error">Phone number must be formatted as (xxx)xxx-xxxx.</p>
+      </div>
+    ';
+}
+?>
+</body>
+
+</html>
diff --git a/validation/js/.gitkeep b/validation/js/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/validation/js/index.js b/validation/js/index.js
new file mode 100644
index 0000000..e69de29
diff --git a/validation/process.php b/validation/process.php
new file mode 100644
index 0000000..c1c548f
--- /dev/null
+++ b/validation/process.php
@@ -0,0 +1,37 @@
+<!doctype html>
+<html lang="en">
+
+<head>
+  <title>Dummy Title</title>
+  <link href="css/styles.css" type="text/css" rel="stylesheet">
+  <script src="js/index.js"></script>
+</head>
+
+<body>
+  <h1>Validation Assignment</h1>
+<?php
+validate($_POST['phone_number']);
+?>
+
+</body>
+
+</html>
+
+<?php
+function validate($number)
+{
+    // Valid format: (999)999-9999
+    $valid_format_regex = '/[(]\d{3}[)]\d{3}-\d{4}/';
+    if (preg_match($valid_format_regex, $number)) {
+        echo '
+        <div class="card success">
+          <h3 class="success">Thank You!</h3>
+          <p class="success">You entered: ' . $number . ', a valid phone number.</p>
+          <img src="img/success.jpg" />
+        </div>
+';
+    } else {
+        header('Location: .?error=' . $number);
+    }
+}
+?>
