commit 5fdfa3c31049d0e1ef5166f148e9ac4906bc490a
Author: timshen <timshen@google.com>
Date:   Sun Jul 6 01:40:32 2014 -0700

    	PR libstdc++/61720
    	* include/bits/regex_executor.tcc (_Executor<>::_M_main_dispatch):
    	Clear match queue for next use.
    	* testsuite/28_regex/general_testcases.cc: New file for general
    	testcases.

diff --git a/libstdc++-v3/include/bits/regex_executor.tcc b/libstdc++-v3/include/bits/regex_executor.tcc
index 38b8ff2..3c68668 100644
--- a/libstdc++-v3/include/bits/regex_executor.tcc
+++ b/libstdc++-v3/include/bits/regex_executor.tcc
@@ -137,6 +137,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	}
       if (__match_mode == _Match_mode::_Exact)
 	__ret = _M_has_sol;
+      _M_states._M_match_queue.clear();
       return __ret;
     }
 
diff --git a/libstdc++-v3/testsuite/28_regex/general_testcases.cc b/libstdc++-v3/testsuite/28_regex/general_testcases.cc
new file mode 100644
index 0000000..c7372ab
--- /dev/null
+++ b/libstdc++-v3/testsuite/28_regex/general_testcases.cc
@@ -0,0 +1,53 @@
+// { dg-options "-std=gnu++11" }
+
+//
+// Copyright (C) 2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// This file is for general testcases in regex.
+// We use a single file for multiple testcases because it takes too long to
+// compile regex for each testcase in a single file.
+// Normal testcases in other files should be moved into this file in the future.
+
+#include <regex>
+#include <testsuite_hooks.h>
+#include <testsuite_regex.h>
+
+using namespace __gnu_test;
+using namespace std;
+
+// libstdc++/61720
+void
+PR61720()
+{
+  bool test __attribute__((unused)) = true;
+
+  string test = R"("test\")";
+  VERIFY(!regex_search_debug(test, regex(R"("([^"]|\\")*[^\\]")")));
+  VERIFY(!regex_match_debug(test, regex(R"("([^"]|\\")*[^\\]")")));
+  VERIFY(!regex_search_debug(test, regex(R"("([^"]|\\")*[^\\]")",
+					 regex_constants::extended)));
+  VERIFY(!regex_match_debug(test, regex(R"("([^"]|\\")*[^\\]")",
+					regex_constants::extended)));
+}
+
+int
+main()
+{
+  PR61720();
+  return 0;
+}