diff --git a/src/lex.js b/src/lex.js
index 7626e252cb..c5431649a1 100644
--- a/src/lex.js
+++ b/src/lex.js
@@ -1987,7 +1987,8 @@ Lexer.prototype = {
       if (type === "(identifier)") {
         if (value === "return" || value === "case" || value === "yield" ||
             value === "typeof" || value === "instanceof" || value === "void" ||
-            value === "await") {
+            value === "await" || value === "new" || value === "delete" ||
+            value === "default" || value === "extends") {
           this.prereg = true;
         }
 
diff --git a/tests/test262/expectations.txt b/tests/test262/expectations.txt
index 468e0aab2d..183b9ba969 100644
--- a/tests/test262/expectations.txt
+++ b/tests/test262/expectations.txt
@@ -117,8 +117,6 @@ test/annexB/language/expressions/object/__proto__-duplicate.js(strict mode)
 test/annexB/language/statements/for-in/nonstrict-initializer.js(default)
 test/built-ins/Function/prototype/toString/unicode.js(default)
 test/built-ins/Function/prototype/toString/unicode.js(strict mode)
-test/built-ins/RegExp/S15.10.7_A2_T1.js(default)
-test/built-ins/RegExp/S15.10.7_A2_T1.js(strict mode)
 test/language/asi/S7.9.2_A1_T2.js(default)
 test/language/asi/S7.9_A1.js(default)
 test/language/asi/S7.9_A1.js(strict mode)
diff --git a/tests/unit/parser.js b/tests/unit/parser.js
index 8e99695bbc..3c37cdf16c 100644
--- a/tests/unit/parser.js
+++ b/tests/unit/parser.js
@@ -761,6 +761,21 @@ exports.regexp.basic = function (test) {
       "void /\\09/;"
     ]);
 
+  TestRun(test, "following `new`")
+    .addError(1, 5, "Bad constructor.")
+    .addError(1, 5, "Missing '()' invoking a constructor.")
+    .test("new /./;");
+
+  TestRun(test, "following `delete`")
+    .addError(1, 11, "Variables should not be deleted.")
+    .test("delete /./;");
+
+  TestRun(test, "following `extends`")
+    .test("class R extends /./ {}", {esversion: 6});
+
+  TestRun(test, "following `default`")
+    .test("export default /./;", {esversion: 6, module: true});
+
   test.done();
 };