add test for es6 unicode escapes

eslint/babel-eslint-parser/test/non-regression.js

@@ -1329,6 +1329,14 @@ describe("verify", function () {
       ].join("\n"),
       { "no-dupe-keys": 1 },
       []
-    )
+    );
+  });
+
+  it("regex with es6 unicodeCodePointEscapes", function () {
+    verifyAndAssertMessages(
+      "string.replace(/[\u{0000A0}-\u{10FFFF}<>\&]/gmiu, (char) => `&#x${char.codePointAt(0).toString(16)};`);",
+      {},
+      []
+    );
   });
 });