diff --git a/src/main/scala/gitbucket/core/controller/AccountController.scala b/src/main/scala/gitbucket/core/controller/AccountController.scala
index d682509..5383eaa 100644
--- a/src/main/scala/gitbucket/core/controller/AccountController.scala
+++ b/src/main/scala/gitbucket/core/controller/AccountController.scala
@@ -91,7 +91,7 @@
 
   val newRepositoryForm = mapping(
     "owner"        -> trim(label("Owner"          , text(required, maxlength(40), identifier, existsAccount))),
-    "name"         -> trim(label("Repository name", text(required, maxlength(40), identifier, uniqueRepository))),
+    "name"         -> trim(label("Repository name", text(required, maxlength(40), repository, uniqueRepository))),
     "description"  -> trim(label("Description"    , optional(text()))),
     "isPrivate"    -> trim(label("Repository Type", boolean())),
     "createReadme" -> trim(label("Create README"  , boolean()))
diff --git a/src/main/scala/gitbucket/core/util/Validations.scala b/src/main/scala/gitbucket/core/util/Validations.scala
index 7aa533e..9c97661 100644
--- a/src/main/scala/gitbucket/core/util/Validations.scala
+++ b/src/main/scala/gitbucket/core/util/Validations.scala
@@ -6,7 +6,7 @@
 trait Validations {
 
   /**
-   * Constraint for the identifier such as user name, repository name or page name.
+   * Constraint for the identifier such as user name or page name.
    */
   def identifier: Constraint = new Constraint(){
     override def validate(name: String, value: String, messages: Messages): Option[String] =
@@ -19,6 +19,23 @@
       }
   }
 
+  /**
+   * Constraint for the repository identifier.
+   */
+  def repository: Constraint = new Constraint(){
+    override def validate(name: String, value: String, messages: Messages): Option[String] =
+      if(!value.matches("[a-zA-Z0-9\\-\\+_.]+")){
+        Some(s"${name} contains invalid character.")
+      } else if(value.startsWith("_") || value.startsWith("-")){
+        Some(s"${name} starts with invalid character.")
+      } else {
+        None
+      }
+  }
+
+  /**
+   * Constraint for the color pattern.
+   */
   def color = pattern("#[0-9a-fA-F]{6}")
 
   /**