diff --git a/res/composer-schema.json b/res/composer-schema.json
index 166a80820..e4e460b89 100644
--- a/res/composer-schema.json
+++ b/res/composer-schema.json
@@ -6,7 +6,7 @@
         "name": {
             "type": "string",
             "description": "Package name, including 'vendor-name/' prefix.",
-            "pattern": "^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9](([_.]?|-{0,2})[a-z0-9]+)*$"
+            "pattern": "^[a-z0-9]([_.-]?[a-z0-9]++)*+/[a-z0-9](([_.]|-{1,2})?[a-z0-9]++)*+$"
         },
         "description": {
             "type": "string",
diff --git a/src/Composer/Package/Loader/ValidatingArrayLoader.php b/src/Composer/Package/Loader/ValidatingArrayLoader.php
index 7fb2c3b79..f05ba512f 100644
--- a/src/Composer/Package/Loader/ValidatingArrayLoader.php
+++ b/src/Composer/Package/Loader/ValidatingArrayLoader.php
@@ -456,7 +456,7 @@ class ValidatingArrayLoader implements LoaderInterface
             return null;
         }
 
-        if (!Preg::isMatch('{^[a-z0-9](?:[_.-]?[a-z0-9]+)*/[a-z0-9](?:(?:[_.]?|-{0,2})[a-z0-9]+)*$}iD', $name)) {
+        if (!Preg::isMatch('{^[a-z0-9](?:[_.-]?[a-z0-9]++)*+/[a-z0-9](?:(?:[_.]|-{1,2})?[a-z0-9]++)*+$}iD', $name)) {
             return $name.' is invalid, it should have a vendor name, a forward slash, and a package name. The vendor and package name can be words separated by -, . or _. The complete name should match "^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9](([_.]?|-{0,2})[a-z0-9]+)*$".';
         }
 
diff --git a/tests/Composer/Test/Json/ComposerSchemaTest.php b/tests/Composer/Test/Json/ComposerSchemaTest.php
index e45da5df3..8c252a046 100644
--- a/tests/Composer/Test/Json/ComposerSchemaTest.php
+++ b/tests/Composer/Test/Json/ComposerSchemaTest.php
@@ -25,9 +25,9 @@ class ComposerSchemaTest extends TestCase
         $expectedError = array(
             array(
                 'property' => 'name',
-                'message' => 'Does not match the regex pattern ^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9](([_.]?|-{0,2})[a-z0-9]+)*$',
+                'message' => 'Does not match the regex pattern ^[a-z0-9]([_.-]?[a-z0-9]++)*+/[a-z0-9](([_.]|-{1,2})?[a-z0-9]++)*+$',
                 'constraint' => 'pattern',
-                'pattern' => '^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9](([_.]?|-{0,2})[a-z0-9]+)*$',
+                'pattern' => '^[a-z0-9]([_.-]?[a-z0-9]++)*+/[a-z0-9](([_.]|-{1,2})?[a-z0-9]++)*+$',
             ),
         );