diff --git a/dlls/msxml3/tests/schema.c b/dlls/msxml3/tests/schema.c
index d1622ffc7da..f4bff68aaeb 100644
--- a/dlls/msxml3/tests/schema.c
+++ b/dlls/msxml3/tests/schema.c
@@ -1012,6 +1012,180 @@ static void test_collection_content(void)
     free_bstrs();
 }
 
+static HRESULT validate_regex(const WCHAR *regex, const WCHAR *input)
+{
+    static const WCHAR regex_doc[] =
+L""
+"<?xml version='1.0'?>"
+"<root xmlns='urn:test'>%s</root>";
+
+    static const WCHAR regex_schema[] =
+L"<?xml version='1.0'?>"
+"<schema xmlns='http://www.w3.org/2001/XMLSchema'"
+"            targetNamespace='urn:test'>"
+"    <element name='root'>"
+"        <simpleType>"
+"            <restriction base='string'>"
+"                <pattern value='%s'/>"
+"            </restriction>"
+"        </simpleType>"
+"    </element>"
+"</schema>";
+
+    IXMLDOMDocument2 *doc;
+    IXMLDOMDocument2 *schema;
+    IXMLDOMSchemaCollection *cache;
+    IXMLDOMParseError* err;
+    WCHAR buffer[1024];
+    BSTR namespace;
+    BSTR bstr;
+    VARIANT v;
+    VARIANT_BOOL b;
+    HRESULT hr;
+
+    doc = create_document_version(60, &IID_IXMLDOMDocument2);
+    ok(doc != NULL, "Failed to create a document.\n");
+
+    schema = create_document_version(60, &IID_IXMLDOMDocument2);
+    ok(schema != NULL, "Failed to create a document.\n");
+
+    cache = create_cache_version(60, &IID_IXMLDOMSchemaCollection);
+    ok(cache != NULL, "Failed to create schema collection.\n");
+
+    if (!doc || !schema || !cache)
+    {
+        if (doc)
+            IXMLDOMDocument2_Release(doc);
+        if (schema)
+            IXMLDOMDocument2_Release(schema);
+        if (cache)
+            IXMLDOMSchemaCollection_Release(cache);
+        return E_OUTOFMEMORY;
+    }
+
+    VariantInit(&v);
+
+    swprintf(buffer, ARRAY_SIZE(buffer), regex_doc, input);
+    bstr = SysAllocString(buffer);
+    ole_check(IXMLDOMDocument2_loadXML(doc, bstr, &b));
+    ok(b == VARIANT_TRUE, "failed to load XML\n");
+    SysFreeString(bstr);
+
+    swprintf(buffer, ARRAY_SIZE(buffer), regex_schema, regex);
+    bstr = SysAllocString(buffer);
+    ole_check(IXMLDOMDocument2_loadXML(schema, bstr, &b));
+    ok(b == VARIANT_TRUE, "failed to load XML\n");
+    SysFreeString(bstr);
+
+    /* add the schema to the cache */
+    V_VT(&v) = VT_DISPATCH;
+    V_DISPATCH(&v) = NULL;
+    ole_check(IXMLDOMDocument2_QueryInterface(schema, &IID_IDispatch, (void**)&V_DISPATCH(&v)));
+    ok(V_DISPATCH(&v) != NULL, "failed to get IDispatch interface\n");
+    namespace = alloc_str_from_narrow("urn:test");
+    hr = IXMLDOMSchemaCollection_add(cache, namespace, v);
+    SysFreeString(namespace);
+    VariantClear(&v);
+    if (FAILED(hr))
+        goto end;
+
+    /* associate the cache to the doc */
+    V_VT(&v) = VT_DISPATCH;
+    V_DISPATCH(&v) = NULL;
+    ole_check(IXMLDOMSchemaCollection_QueryInterface(cache, &IID_IDispatch, (void**)&V_DISPATCH(&v)));
+    ok(V_DISPATCH(&v) != NULL, "failed to get IDispatch interface\n");
+    ole_check(IXMLDOMDocument2_putref_schemas(doc, v));
+    VariantClear(&v);
+
+    /* validate the doc
+     * only declared elements in the declared order
+     * this is fine */
+    err = NULL;
+    bstr = NULL;
+    hr = IXMLDOMDocument2_validate(doc, &err);
+    ok(err != NULL, "domdoc_validate() should always set err\n");
+    if (IXMLDOMParseError_get_reason(err, &bstr) != S_FALSE)
+        trace("got error: %s\n", wine_dbgstr_w(bstr));
+    SysFreeString(bstr);
+    IXMLDOMParseError_Release(err);
+
+end:
+    IXMLDOMDocument2_Release(doc);
+    IXMLDOMDocument2_Release(schema);
+    IXMLDOMSchemaCollection_Release(cache);
+
+    return hr;
+}
+
+static void test_nonstandard_regex(void)
+{
+    HRESULT hr;
+
+    hr = validate_regex(L"\\!", L"!");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\\"", L"\"");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\#", L"#");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"$", L"$");
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+    hr = validate_regex(L"\\$", L"$");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\%", L"%");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\,", L",");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"/", L"/");
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+    hr = validate_regex(L"\\/", L"/");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\:", L":");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\;", L";");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\=", L"=");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\>", L">");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\@", L"@");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\`", L"`");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\~", L"~");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+
+    hr = validate_regex(L"\\uCAFE", L"\xCAFE");
+todo_wine
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+}
+
 static void test_XDR_schemas(void)
 {
     IXMLDOMDocument2 *doc, *schema;
@@ -1669,6 +1843,7 @@ START_TEST(schema)
     test_collection_refs();
     test_length();
     test_collection_content();
+    test_nonstandard_regex();
     test_XDR_schemas();
     test_XDR_datatypes();
     test_validate_on_load();