diff --git a/system/typemill/Models/Validation.php b/system/typemill/Models/Validation.php
index 2ea11a1..df718fe 100644
--- a/system/typemill/Models/Validation.php
+++ b/system/typemill/Models/Validation.php
@@ -127,13 +127,15 @@ class Validation
 		
 		Validator::addRule('navigation', function($field, $value, array $params, array $fields)
 		{
-			$format = '/[@#^*()=\[\]{};:"\\|,.<>\/]/';
-			if ( preg_match($format, $value))
+#			$format = '/[@#^*()=\[\]{};:"\\|,.<>\/]/';
+			$format = '/^(?![ .])[^\0\/\\?%*:|"<>]+(?<![ .])$|^(?![ .])[^\0\/\\?%*:|"<>]+[!?]$/';
+
+			if ( preg_match($format, $value) === 1)
 			{
-				return false;
+				return true;
 			}
-			return true;
-		}, 'contains special characters');
+			return false;
+		}, 'contains invalid characters or patterns');
 
 		Validator::addRule('noSpecialChars', function($field, $value, array $params, array $fields)
 		{
diff --git a/system/typemill/author/js/vue-contentnavi.js b/system/typemill/author/js/vue-contentnavi.js
index e32a5d4..ec986e9 100644
--- a/system/typemill/author/js/vue-contentnavi.js
+++ b/system/typemill/author/js/vue-contentnavi.js
@@ -223,7 +223,8 @@ navigation.component('navilevel',{
 			load: '?',
 			freeze: false,
 			newItem: '',
-			format: /[@#*()=\[\]{};:"\\|,.<>\/]/,			
+/*			format: /[@#*()=\[\]{};:"\\|,.<>\/]/, */
+	        format: /(^\.)|(\.$)|[\/\\?%*:|"<>]/,
 		}
 	},
 	computed: 
@@ -400,9 +401,13 @@ navigation.component('navilevel',{
 		{
 			eventBus.$emit('publisherclear');
 
-			if(	this.format.test(this.newItem) ||  !this.newItem || this.newItem.length > 40)
+			if(	
+				this.format.test(this.newItem) ||  
+				!this.newItem || 
+				this.newItem.length > 60
+			)
 			{
-				let message = this.$filters.translate('Special Characters are not allowed. Length between 1 and 40.');
+				let message = this.$filters.translate('Special characters or invalid patterns are not allowed. Length between 1 and 60.');
 				eventBus.$emit('publishermessage', message);
 				return;
 			}