diff --git a/json/README.md b/json/README.md
index aa63a6c..355defd 100644
--- a/json/README.md
+++ b/json/README.md
@@ -99,6 +99,7 @@ This suite is being used by:
 * [skeemas](https://github.com/Prestaul/skeemas)
 * [tv4](https://github.com/geraintluff/tv4)
 * [z-schema](https://github.com/zaggino/z-schema)
+* [jsen](https://github.com/bugventure/jsen)
 
 ### .NET ###
 
diff --git a/json/tests/draft3/optional/format.json b/json/tests/draft3/optional/format.json
index fc86b03..3ca7319 100644
--- a/json/tests/draft3/optional/format.json
+++ b/json/tests/draft3/optional/format.json
@@ -77,6 +77,11 @@
                 "data": "http://foo.bar/?baz=qux#quux",
                 "valid": true
             },
+            {
+                "description": "a valid protocol-relative URI",
+                "data": "//foo.bar/?baz=qux#quux",
+                "valid": true
+            },
             {
                 "description": "an invalid URI",
                 "data": "\\\\WINDOWS\\fileshare",
diff --git a/json/tests/draft3/pattern.json b/json/tests/draft3/pattern.json
index befc4b5..25e7299 100644
--- a/json/tests/draft3/pattern.json
+++ b/json/tests/draft3/pattern.json
@@ -19,5 +19,16 @@
                 "valid": true
             }
         ]
+    },
+    {
+        "description": "pattern is not anchored",
+        "schema": {"pattern": "a+"},
+        "tests": [
+            {
+                "description": "matches a substring",
+                "data": "xxaayy",
+                "valid": true
+            }
+        ]
     }
 ]
diff --git a/json/tests/draft3/ref.json b/json/tests/draft3/ref.json
index c984019..903ecb6 100644
--- a/json/tests/draft3/ref.json
+++ b/json/tests/draft3/ref.json
@@ -86,19 +86,34 @@
         },
         "tests": [
             {
-                "description": "slash",
+                "description": "slash invalid",
                 "data": {"slash": "aoeu"},
                 "valid": false
             },
             {
-                "description": "tilda",
+                "description": "tilda invalid",
                 "data": {"tilda": "aoeu"},
                 "valid": false
             },
             {
-                "description": "percent",
+                "description": "percent invalid",
                 "data": {"percent": "aoeu"},
                 "valid": false
+            },
+            {
+                "description": "slash valid",
+                "data": {"slash": 123},
+                "valid": true
+            },
+            {
+                "description": "tilda valid",
+                "data": {"tilda": 123},
+                "valid": true
+            },
+            {
+                "description": "percent valid",
+                "data": {"percent": 123},
+                "valid": true
             }
         ]
     },
diff --git a/json/tests/draft4/optional/format.json b/json/tests/draft4/optional/format.json
index 53c5d25..aacfd11 100644
--- a/json/tests/draft4/optional/format.json
+++ b/json/tests/draft4/optional/format.json
@@ -29,6 +29,11 @@
                 "data": "http://foo.bar/?baz=qux#quux",
                 "valid": true
             },
+            {
+                "description": "a valid protocol-relative URI",
+                "data": "//foo.bar/?baz=qux#quux",
+                "valid": true
+            },
             {
                 "description": "an invalid URI",
                 "data": "\\\\WINDOWS\\fileshare",
diff --git a/json/tests/draft4/pattern.json b/json/tests/draft4/pattern.json
index befc4b5..25e7299 100644
--- a/json/tests/draft4/pattern.json
+++ b/json/tests/draft4/pattern.json
@@ -19,5 +19,16 @@
                 "valid": true
             }
         ]
+    },
+    {
+        "description": "pattern is not anchored",
+        "schema": {"pattern": "a+"},
+        "tests": [
+            {
+                "description": "matches a substring",
+                "data": "xxaayy",
+                "valid": true
+            }
+        ]
     }
 ]
diff --git a/json/tests/draft4/ref.json b/json/tests/draft4/ref.json
index b38ff03..7e80552 100644
--- a/json/tests/draft4/ref.json
+++ b/json/tests/draft4/ref.json
@@ -86,19 +86,34 @@
         },
         "tests": [
             {
-                "description": "slash",
+                "description": "slash invalid",
                 "data": {"slash": "aoeu"},
                 "valid": false
             },
             {
-                "description": "tilda",
+                "description": "tilda invalid",
                 "data": {"tilda": "aoeu"},
                 "valid": false
             },
             {
-                "description": "percent",
+                "description": "percent invalid",
                 "data": {"percent": "aoeu"},
                 "valid": false
+            },
+            {
+                "description": "slash valid",
+                "data": {"slash": 123},
+                "valid": true
+            },
+            {
+                "description": "tilda valid",
+                "data": {"tilda": 123},
+                "valid": true
+            },
+            {
+                "description": "percent valid",
+                "data": {"percent": 123},
+                "valid": true
             }
         ]
     },