diff --git a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.java b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.java
index 2e3596d..b6e5c75 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.java
@@ -44,7 +44,7 @@ public class TagsPanel extends Composite{
 
 
 	// regular expression for tags
-	private static final String REGEX_TAG = "^[a-zA-Z0-9]*$";
+	private static final String REGEX_TAG = "^[a-zA-Z0-9_\\-.]*$";
 
 	// tags list
 	private List<String> tagsList = new ArrayList<String>();
diff --git a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.ui.xml b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.ui.xml
index e0cc6b4..fb111b8 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.ui.xml
+++ b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/dataset/resources/TagsPanel.ui.xml
@@ -8,13 +8,13 @@
 	</ui:style>
 	<g:HTMLPanel>
 		<b:ControlGroup ui:field="tagsInsertGroup">
-			<b:ControlLabel for="tags" title="Product tags">
+			<b:ControlLabel for="tags" title="Item tag">
 				<font color="red">*</font>
-				Tags:
+				Tag:
 			</b:ControlLabel>
 			<b:Controls ui:field="controlAsTextBox">
 				<b:TextBox width="90%" placeholder="Enter one or more tag for the item"
-					b:id="tags" ui:field="tagsEnterTextBox" />
+					b:id="tags" ui:field="tagsEnterTextBox" maxLength="100"/>
 				<b:ListBox width="91%" title="HOLD CTRL or CMD for multiple selection"
 					b:id="tags" ui:field="tagsEnterListBox" multipleSelect="true"/>
 				<span style="float:right; width:5%; color: #aaaaaa;">