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diff --git a/js/src/tests/non262/extensions/regress-188206-02.js b/js/src/tests/non262/extensions/regress-188206-02.js
new file mode 100644
index 0000000000..4cf9dd7b30
--- /dev/null
+++ b/js/src/tests/non262/extensions/regress-188206-02.js
@@ -0,0 +1,121 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 188206;
+var summary = 'Invalid use of regexp quantifiers should generate SyntaxErrors';
+var CHECK_PASSED = 'Should not generate an error';
+var CHECK_FAILED = 'Generated an error!';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+
+/*
+ * Misusing the {DecmalDigits} quantifier - according to ECMA,
+ * but not according to Perl.
+ *
+ * ECMA-262 Edition 3 prohibits the use of unescaped braces in
+ * regexp patterns, unless they form part of a quantifier.
+ *
+ * Hovever, Perl does not prohibit this. If not used as part
+ * of a quantifer, Perl treats braces literally.
+ *
+ * We decided to follow Perl on this for backward compatibility.
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=190685.
+ *
+ * Therefore NONE of the following ECMA violations should generate
+ * a SyntaxError. Note we use checkThis() instead of testThis().
+ */
+status = inSection(13);
+checkThis(' /a*{/ ');
+
+status = inSection(14);
+checkThis(' /a{}/ ');
+
+status = inSection(15);
+checkThis(' /{a/ ');
+
+status = inSection(16);
+checkThis(' /}a/ ');
+
+status = inSection(17);
+checkThis(' /x{abc}/ ');
+
+status = inSection(18);
+checkThis(' /{{0}/ ');
+
+status = inSection(19);
+checkThis(' /{{1}/ ');
+
+status = inSection(20);
+checkThis(' /x{{0}/ ');
+
+status = inSection(21);
+checkThis(' /x{{1}/ ');
+
+status = inSection(22);
+checkThis(' /x{{0}}/ ');
+
+status = inSection(23);
+checkThis(' /x{{1}}/ ');
+
+status = inSection(24);
+checkThis(' /x{{0}}/ ');
+
+status = inSection(25);
+checkThis(' /x{{1}}/ ');
+
+status = inSection(26);
+checkThis(' /x{{0}}/ ');
+
+status = inSection(27);
+checkThis(' /x{{1}}/ ');
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+/*
+ * Allowed syntax shouldn't generate any errors
+ */
+function checkThis(sAllowedSyntax)
+{
+  expect = CHECK_PASSED;
+  actual = CHECK_PASSED;
+
+  try
+  {
+    eval(sAllowedSyntax);
+  }
+  catch(e)
+  {
+    actual = CHECK_FAILED;
+  }
+
+  statusitems[UBound] = status;
+  expectedvalues[UBound] = expect;
+  actualvalues[UBound] = actual;
+  UBound++;
+}
+
+
+function test()
+{
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+}