diff --git a/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/extensions/ExtensionResource.java b/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/extensions/ExtensionResource.java
index 13eca7f5a01..66dbd8b0d12 100644
--- a/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/extensions/ExtensionResource.java
+++ b/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/extensions/ExtensionResource.java
@@ -138,7 +138,7 @@ public Response getTypes(@HeaderParam("Accept-Language") @ApiParam(value = "lang
     }
 
     @GET
-    @Path("/{extensionId: [a-zA-Z_0-9-]*}")
+    @Path("/{extensionId: [a-zA-Z_0-9-]+}")
     @Produces(MediaType.APPLICATION_JSON)
     @ApiOperation(value = "Get extension with given ID.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK", response = String.class),
@@ -157,7 +157,7 @@ public Response getById(@HeaderParam("Accept-Language") @ApiParam(value = "langu
     }
 
     @POST
-    @Path("/{extensionId: [a-zA-Z_0-9-:]*}/install")
+    @Path("/{extensionId: [a-zA-Z_0-9-:]+}/install")
     @ApiOperation(value = "Installs the extension with the given ID.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK") })
     public Response installExtension(
@@ -194,7 +194,7 @@ public Response installExtensionByURL(
     }
 
     @POST
-    @Path("/{extensionId: [a-zA-Z_0-9-:]*}/uninstall")
+    @Path("/{extensionId: [a-zA-Z_0-9-:]+}/uninstall")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK") })
     public Response uninstallExtension(
             final @PathParam("extensionId") @ApiParam(value = "extension ID", required = true) String extensionId) {
diff --git a/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/item/ItemResource.java b/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/item/ItemResource.java
index 974210eb28e..afdee23db5a 100644
--- a/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/item/ItemResource.java
+++ b/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/item/ItemResource.java
@@ -236,7 +236,7 @@ public Response getItems(
 
     @GET
     @RolesAllowed({ Role.USER, Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}")
     @Produces({ MediaType.APPLICATION_JSON })
     @ApiOperation(value = "Gets a single item.", response = EnrichedItemDTO.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK", response = EnrichedItemDTO.class),
@@ -276,7 +276,7 @@ private Set<String> splitAndFilterNamespaces(@Nullable String namespaceSelector,
      */
     @GET
     @RolesAllowed({ Role.USER, Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}/state")
+    @Path("/{itemname: [a-zA-Z_0-9]+}/state")
     @Produces(MediaType.TEXT_PLAIN)
     @ApiOperation(value = "Gets the state of an item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK", response = String.class),
@@ -301,7 +301,7 @@ public Response getPlainItemState(
 
     @PUT
     @RolesAllowed({ Role.USER, Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}/state")
+    @Path("/{itemname: [a-zA-Z_0-9]+}/state")
     @Consumes(MediaType.TEXT_PLAIN)
     @ApiOperation(value = "Updates the state of an item.")
     @ApiResponses(value = { @ApiResponse(code = 202, message = "Accepted"),
@@ -341,7 +341,7 @@ public Response putItemState(
 
     @POST
     @RolesAllowed({ Role.USER, Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}")
     @Consumes(MediaType.TEXT_PLAIN)
     @ApiOperation(value = "Sends a command to an item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
@@ -388,7 +388,7 @@ public Response postItemCommand(
 
     @PUT
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemName: [a-zA-Z_0-9]*}/members/{memberItemName: [a-zA-Z_0-9]*}")
+    @Path("/{itemName: [a-zA-Z_0-9]+}/members/{memberItemName: [a-zA-Z_0-9]+}")
     @ApiOperation(value = "Adds a new member to a group item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
             @ApiResponse(code = 404, message = "Item or member item not found or item is not of type group item."),
@@ -426,7 +426,7 @@ public Response addMember(@PathParam("itemName") @ApiParam(value = "item name",
 
     @DELETE
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemName: [a-zA-Z_0-9]*}/members/{memberItemName: [a-zA-Z_0-9]*}")
+    @Path("/{itemName: [a-zA-Z_0-9]+}/members/{memberItemName: [a-zA-Z_0-9]+}")
     @ApiOperation(value = "Removes an existing member from a group item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
             @ApiResponse(code = 404, message = "Item or member item not found or item is not of type group item."),
@@ -464,7 +464,7 @@ public Response removeMember(@PathParam("itemName") @ApiParam(value = "item name
 
     @DELETE
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}")
     @ApiOperation(value = "Removes an item from the registry.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
             @ApiResponse(code = 404, message = "Item not found or item is not editable.") })
@@ -478,7 +478,7 @@ public Response removeItem(@PathParam("itemname") @ApiParam(value = "item name",
 
     @PUT
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}/tags/{tag}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}/tags/{tag}")
     @ApiOperation(value = "Adds a tag to an item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
             @ApiResponse(code = 404, message = "Item not found."),
@@ -504,7 +504,7 @@ public Response addTag(@PathParam("itemname") @ApiParam(value = "item name", req
 
     @DELETE
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}/tags/{tag}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}/tags/{tag}")
     @ApiOperation(value = "Removes a tag from an item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
             @ApiResponse(code = 404, message = "Item not found."),
@@ -530,7 +530,7 @@ public Response removeTag(@PathParam("itemname") @ApiParam(value = "item name",
 
     @PUT
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}/metadata/{namespace}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}/metadata/{namespace}")
     @Consumes(MediaType.APPLICATION_JSON)
     @ApiOperation(value = "Adds metadata to an item.")
     @ApiResponses(value = { //
@@ -570,7 +570,7 @@ public Response addMetadata(@PathParam("itemname") @ApiParam(value = "item name"
 
     @DELETE
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}/metadata/{namespace}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}/metadata/{namespace}")
     @ApiOperation(value = "Removes metadata from an item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
             @ApiResponse(code = 404, message = "Item not found."),
@@ -610,7 +610,7 @@ public Response removeMetadata(
      */
     @PUT
     @RolesAllowed({ Role.ADMIN })
-    @Path("/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/{itemname: [a-zA-Z_0-9]+}")
     @Consumes(MediaType.APPLICATION_JSON)
     @ApiOperation(value = "Adds a new item to the registry or updates the existing item.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK", response = String.class),
diff --git a/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/persistence/PersistenceResource.java b/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/persistence/PersistenceResource.java
index 4cf8cb22cf8..21314d50e5e 100644
--- a/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/persistence/PersistenceResource.java
+++ b/bundles/org.openhab.core.io.rest.core/src/main/java/org/eclipse/smarthome/io/rest/core/internal/persistence/PersistenceResource.java
@@ -162,7 +162,7 @@ public Response httpGetPersistenceServiceItems(@Context HttpHeaders headers,
 
     @GET
     @RolesAllowed({ Role.USER, Role.ADMIN })
-    @Path("/items/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/items/{itemname: [a-zA-Z_0-9]+}")
     @Produces({ MediaType.APPLICATION_JSON })
     @ApiOperation(value = "Gets item persistence data from the persistence service.", response = ItemHistoryDTO.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK", response = ItemHistoryDTO.class),
@@ -184,7 +184,7 @@ public Response httpGetPersistenceItemData(@Context HttpHeaders headers,
 
     @DELETE
     @RolesAllowed({ Role.ADMIN })
-    @Path("/items/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/items/{itemname: [a-zA-Z_0-9]+}")
     @Produces({ MediaType.APPLICATION_JSON })
     @ApiOperation(value = "Delete item data from a specific persistence service.", response = String.class, responseContainer = "List")
     @ApiResponses(value = {
@@ -203,7 +203,7 @@ public Response httpDeletePersistenceServiceItem(@Context HttpHeaders headers,
 
     @PUT
     @RolesAllowed({ Role.ADMIN })
-    @Path("/items/{itemname: [a-zA-Z_0-9]*}")
+    @Path("/items/{itemname: [a-zA-Z_0-9]+}")
     @Produces({ MediaType.APPLICATION_JSON })
     @ApiOperation(value = "Stores item persistence data into the persistence service.", response = ItemHistoryDTO.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK", response = ItemHistoryDTO.class),
diff --git a/bundles/org.openhab.core.io.rest.sitemap/src/main/java/org/eclipse/smarthome/io/rest/sitemap/internal/SitemapResource.java b/bundles/org.openhab.core.io.rest.sitemap/src/main/java/org/eclipse/smarthome/io/rest/sitemap/internal/SitemapResource.java
index 834b1741811..fcb4ed2c3d6 100644
--- a/bundles/org.openhab.core.io.rest.sitemap/src/main/java/org/eclipse/smarthome/io/rest/sitemap/internal/SitemapResource.java
+++ b/bundles/org.openhab.core.io.rest.sitemap/src/main/java/org/eclipse/smarthome/io/rest/sitemap/internal/SitemapResource.java
@@ -230,7 +230,7 @@ public Response getSitemaps() {
     }
 
     @GET
-    @Path("/{sitemapname: [a-zA-Z_0-9]*}")
+    @Path("/{sitemapname: [a-zA-Z_0-9]+}")
     @Produces(MediaType.APPLICATION_JSON)
     @ApiOperation(value = "Get sitemap by name.", response = SitemapDTO.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK") })
@@ -248,7 +248,7 @@ public Response getSitemapData(@Context HttpHeaders headers,
     }
 
     @GET
-    @Path("/{sitemapname: [a-zA-Z_0-9]*}/{pageid: [a-zA-Z_0-9]*}")
+    @Path("/{sitemapname: [a-zA-Z_0-9]+}/{pageid: [a-zA-Z_0-9]+}")
     @Produces(MediaType.APPLICATION_JSON)
     @ApiOperation(value = "Polls the data for a sitemap.", response = PageDTO.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
@@ -317,7 +317,7 @@ public Object createEventSubscription() {
      *         connection.
      */
     @GET
-    @Path(SEGMENT_EVENTS + "/{subscriptionid: [a-zA-Z_0-9-]*}/")
+    @Path(SEGMENT_EVENTS + "/{subscriptionid: [a-zA-Z_0-9-]+}/")
     @Produces(SseFeature.SERVER_SENT_EVENTS)
     @ApiOperation(value = "Get sitemap events.", response = EventOutput.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
diff --git a/bundles/org.openhab.core.io.rest.voice/src/main/java/org/eclipse/smarthome/io/rest/voice/internal/VoiceResource.java b/bundles/org.openhab.core.io.rest.voice/src/main/java/org/eclipse/smarthome/io/rest/voice/internal/VoiceResource.java
index a44cf1149d4..fa876c71027 100644
--- a/bundles/org.openhab.core.io.rest.voice/src/main/java/org/eclipse/smarthome/io/rest/voice/internal/VoiceResource.java
+++ b/bundles/org.openhab.core.io.rest.voice/src/main/java/org/eclipse/smarthome/io/rest/voice/internal/VoiceResource.java
@@ -107,7 +107,7 @@ public Response getInterpreters(
     }
 
     @GET
-    @Path("/interpreters/{id: [a-zA-Z_0-9]*}")
+    @Path("/interpreters/{id: [a-zA-Z_0-9]+}")
     @Produces(MediaType.APPLICATION_JSON)
     @ApiOperation(value = "Gets a single interpreter.", response = HumanLanguageInterpreterDTO.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),
@@ -126,7 +126,7 @@ public Response getInterpreter(
     }
 
     @POST
-    @Path("/interpreters/{id: [a-zA-Z_0-9]*}")
+    @Path("/interpreters/{id: [a-zA-Z_0-9]+}")
     @Consumes(MediaType.TEXT_PLAIN)
     @ApiOperation(value = "Sends a text to a given human language interpreter.")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "OK"),