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diff --git a/js/src/tests/ecma_3/RegExp/regress-187133.js b/js/src/tests/ecma_3/RegExp/regress-187133.js
new file mode 100644
index 000000000..032b801fe
--- /dev/null
+++ b/js/src/tests/ecma_3/RegExp/regress-187133.js
@@ -0,0 +1,108 @@
+/* -*- 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/. */
+
+/*
+ *
+ * Date:    06 January 2003
+ * SUMMARY: RegExp conformance test
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=187133
+ *
+ * The tests here employ the regular expression construct:
+ *
+ *                   (?!pattern)
+ *
+ * This is a "zero-width lookahead negative assertion".
+ * From the Perl documentation:
+ *
+ *   For example, /foo(?!bar)/ matches any occurrence
+ *   of 'foo' that isn't followed by 'bar'.
+ *
+ * It is "zero-width" means that it does not consume any characters and that
+ * the parens are non-capturing. A non-null match array in the example above
+ * will have only have length 1, not 2.
+ *
+ */
+//-----------------------------------------------------------------------------
+var i = 0;
+var BUGNUMBER = 187133;
+var summary = 'RegExp conformance test';
+var status = '';
+var statusmessages = new Array();
+var pattern = '';
+var patterns = new Array();
+var string = '';
+var strings = new Array();
+var actualmatch = '';
+var actualmatches = new Array();
+var expectedmatch = '';
+var expectedmatches = new Array();
+
+
+pattern = /(\.(?!com|org)|\/)/;
+status = inSection(1);
+string = 'ah.info';
+actualmatch = string.match(pattern);
+expectedmatch = ['.', '.'];
+addThis();
+
+status = inSection(2);
+string = 'ah/info';
+actualmatch = string.match(pattern);
+expectedmatch = ['/', '/'];
+addThis();
+
+status = inSection(3);
+string = 'ah.com';
+actualmatch = string.match(pattern);
+expectedmatch = null;
+addThis();
+
+
+pattern = /(?!a|b)|c/;
+status = inSection(4);
+string = '';
+actualmatch = string.match(pattern);
+expectedmatch = [''];
+addThis();
+
+status = inSection(5);
+string = 'bc';
+actualmatch = string.match(pattern);
+expectedmatch = [''];
+addThis();
+
+status = inSection(6);
+string = 'd';
+actualmatch = string.match(pattern);
+expectedmatch = [''];
+addThis();
+
+
+
+
+//-------------------------------------------------------------------------------------------------
+test();
+//-------------------------------------------------------------------------------------------------
+
+
+function addThis()
+{
+  statusmessages[i] = status;
+  patterns[i] = pattern;
+  strings[i] = string;
+  actualmatches[i] = actualmatch;
+  expectedmatches[i] = expectedmatch;
+  i++;
+}
+
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+  testRegExp(statusmessages, patterns, strings, actualmatches, expectedmatches);
+  exitFunc ('test');
+}