--- webform_validation.validators.inc	2010-03-29 14:55:39.000000000 +0100
+++ webform_validation.validators.inc	2010-04-27 16:14:50.000000000 +0100
@@ -116,6 +116,12 @@ function webform_validation_webform_vali
         'description' => t('Specify how many options a user can select.')
       ),
     ),
+    'plain_text' => array(
+      'name' => "Plain text",
+      'component_types' => array(
+        'textfield',
+      ),
+    ),
     'regex' => array(
       'name' => "Regular expression",
       'component_types' => array(
@@ -232,6 +238,14 @@ function webform_validation_webform_vali
         }
         return $errors;
         break;
+      case "plain_text":
+        foreach ($items as $key => $val) {
+          if ($val && (strcmp($val, strip_tags($val)))) {
+            $errors[$key] = t('%item only allows the use of plain text', array('%item' => $components[$key]['name']));
+          }
+        }
+        return $errors;
+        break;
       case "regex":
         $regex = $rule['data'];
         foreach ($items as $key => $val) {