re PR libstdc++/61720 (std::regex_search matches incorrectly)

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

From-SVN: r212539

libstdc++-v3/ChangeLog

+2014-07-15  Tim Shen  <timshen@google.com>
+
+	PR libstdc++/61720
+	* include/bits/regex_executor.tcc (_Executor<>::_M_main_dispatch):
+	Clear match queue for next use.
+	* testsuite/28_regex/algorithms/regex_search/61720.cc: New file.
+
 2014-07-14  Ulrich Drepper  <drepper@gmail.com>
 
 	* include/ext/random.tcc: Unfortunately more fixes for

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;
     }
 

libstdc++-v3/testsuite/28_regex/algorithms/regex_search/61720.cc

+// { 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/>.
+
+#include <regex>
+#include <testsuite_hooks.h>
+#include <testsuite_regex.h>
+
+using namespace __gnu_test;
+using namespace std;
+
+// libstdc++/61720
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  string s = R"("test\")";
+  VERIFY(!regex_search_debug(s, regex(R"("([^"]|\\")*[^\\]")")));
+  VERIFY(!regex_match_debug(s, regex(R"("([^"]|\\")*[^\\]")")));
+  VERIFY(!regex_search_debug(s, regex(R"("([^"]|\\")*[^\\]")",
+					 regex_constants::extended)));
+  VERIFY(!regex_match_debug(s, regex(R"("([^"]|\\")*[^\\]")",
+					regex_constants::extended)));
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}