Support redirects by regular expression in declarative WebRequest API

chrome/browser/extensions/api/declarative_webrequest/webrequest_action_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 82 matching lines @@
   linked_ptr<json_schema_compiler::any::Any> action2 = make_linked_ptr(
       new json_schema_compiler::any::Any);
   action2->Init(incorrect_action);
   input.push_back(action2);
   error.clear();
   result = WebRequestActionSet::Create(input, &error, &bad_message);
   EXPECT_NE("", error);
   EXPECT_FALSE(result.get());
 }
 
+// Test capture group syntax conversions of WebRequestRedirectByRegExAction
+TEST(WebRequestActionTest, PerlToRe2Style) {
+#define CallPerlToRe2Style WebRequestRedirectByRegExAction::PerlToRe2Style
+  // foo$1bar -> foo\1bar
+  EXPECT_EQ("foo\\1bar", CallPerlToRe2Style("foo$1bar"));
+  // foo\$1bar -> foo$1bar
+  EXPECT_EQ("foo$1bar", CallPerlToRe2Style("foo\\$1bar"));
+  // foo\\$1bar -> foo\\\1bar
+  EXPECT_EQ("foo\\\\\\1bar", CallPerlToRe2Style("foo\\\\$1bar"));
+  // foo\bar -> foobar
+  EXPECT_EQ("foobar", CallPerlToRe2Style("foo\\bar"));
+  // foo$bar -> foo$bar
+  EXPECT_EQ("foo$bar", CallPerlToRe2Style("foo$bar"));
+#undef CallPerlToRe2Style
+}
+
 }  // namespace extensions