diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index a72c1bfe340..7753341182a 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2011-02-17  Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	PR libstdc++/47724
+	* include/bits/regex_compiler.h (_Scanner::_M_advance): Do not treat
+	line anchors as metacharacters.
+	* testsuite/28_regex/basic_regex/ctors/47724.cc: New.
+
 2011-02-16  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/47773
diff --git a/libstdc++-v3/include/bits/regex_compiler.h b/libstdc++-v3/include/bits/regex_compiler.h
index b979c8db14f..f581e64f8a2 100644
--- a/libstdc++-v3/include/bits/regex_compiler.h
+++ b/libstdc++-v3/include/bits/regex_compiler.h
@@ -171,6 +171,9 @@ namespace __regex
 	  _M_scan_in_brace();
 	  return;
 	}
+#if 0
+      // TODO: re-enable line anchors when _M_assertion is implemented.
+      // See PR libstdc++/47724
       else if (_M_state & _S_state_at_start && __c == _M_ctype.widen('^'))
 	{
 	  _M_curToken = _S_token_line_begin;
@@ -183,6 +186,7 @@ namespace __regex
 	  ++_M_current;
 	  return;
 	}
+#endif
       else if (__c == _M_ctype.widen('.'))
 	{
 	  _M_curToken = _S_token_anychar;
diff --git a/libstdc++-v3/testsuite/28_regex/basic_regex/ctors/47724.cc b/libstdc++-v3/testsuite/28_regex/basic_regex/ctors/47724.cc
new file mode 100644
index 00000000000..7a744bbd8b1
--- /dev/null
+++ b/libstdc++-v3/testsuite/28_regex/basic_regex/ctors/47724.cc
@@ -0,0 +1,34 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 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/>.
+
+// PR libstdc++/47724
+
+#include <regex>
+
+void test01()
+{
+  std::regex s("^$");
+}
+
+int
+main()
+{ 
+  test01();
+  return 0;
+};