Add more pattern requirements to form

Author: lulunac27a

index.html

@@ -9,7 +9,7 @@ <h1>HTML Form Validation</h1>
             Date: <input type="text" name="date" pattern="\d{2}/\d{2}/\d{4}" required>
             Email: <input type="text" name="email" pattern="[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$" required>
             Website: <input type="text" name="website" pattern="(https?://)?[a-zA-Z0-9.-]+\.[a-zA-Z]{2,3}(\/[^\s]*)?" required>
-            Phone Number: <input type="text" name="phone" required>
+            Phone Number: <input type="text" name="phone" pattern="\d{3}-?\d{3}-?\d{4}" required>
             <button type="submit">Submit</button>
         </form>
     </body>