diff --git a/static/app.js b/static/app.js
index 49d43ec..c9eba3a 100644
--- a/static/app.js
+++ b/static/app.js
@@ -80,11 +80,12 @@ function renderTable() {
             let value = e.target.value;
             // Only allow plain text, disallow HTML/script tags, max 50 chars
             if (/</.test(value) || />/.test(value) || /["'`\\]/.test(value)) {
-                alert('Guest name cannot contain code or special characters like <, >, ", \\', or backticks.');
+                alert("Guest name cannot contain code or special characters like <, >, \", \\\\, or backticks.");
                 guestNameInput.value = data.guestNames[date] || '';
                 return;
             }
-            if (!/^([\p{L}\p{N}\s\-\.]+)$/u.test(value)) {
+            // Only allow a-z, A-Z, 0-9, spaces, hyphens, periods
+            if (!/^([a-zA-Z0-9 .-]+)$/.test(value)) {
                 alert('Guest name can only contain letters, numbers, spaces, hyphens, and periods.');
                 guestNameInput.value = data.guestNames[date] || '';
                 return;