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diff --git a/libstdc++-v3/include/bits/regex_error.h b/libstdc++-v3/include/bits/regex_error.h
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+// class template regex -*- C++ -*-
+
+// Copyright (C) 2010 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/**
+ * @file bits/regex_error
+ * @brief Error and exception objects for the std regex library.
+ *
+ *  This is an internal header file, included by other library headers.
+ *  You should not attempt to use it directly.
+ */
+
+namespace std
+{
+
+namespace regex_constants
+{
+  /**
+   * @name 5.3 Error Types
+   */
+  //@{
+ 
+  enum error_type
+    {
+      _S_error_collate,
+      _S_error_ctype,
+      _S_error_escape,
+      _S_error_backref,
+      _S_error_brack,
+      _S_error_paren,
+      _S_error_brace,
+      _S_error_badbrace,
+      _S_error_range,
+      _S_error_space,
+      _S_error_badrepeat,
+      _S_error_complexity,
+      _S_error_stack,
+      _S_error_last
+    };
+
+  /** The expression contained an invalid collating element name. */
+  static const error_type error_collate(_S_error_collate);
+
+  /** The expression contained an invalid character class name. */
+  static const error_type error_ctype(_S_error_ctype);
+
+  /**
+   * The expression contained an invalid escaped character, or a trailing
+   * escape.
+   */
+  static const error_type error_escape(_S_error_escape);
+
+  /** The expression contained an invalid back reference. */
+  static const error_type error_backref(_S_error_backref);
+
+  /** The expression contained mismatched [ and ]. */
+  static const error_type error_brack(_S_error_brack);
+
+  /** The expression contained mismatched ( and ). */
+  static const error_type error_paren(_S_error_paren);
+
+  /** The expression contained mismatched { and } */
+  static const error_type error_brace(_S_error_brace);
+
+  /** The expression contained an invalid range in a {} expression. */
+  static const error_type error_badbrace(_S_error_badbrace);
+
+  /**
+   * The expression contained an invalid character range,
+   * such as [b-a] in most encodings.
+   */
+  static const error_type error_range(_S_error_range);
+
+  /**
+   * There was insufficient memory to convert the expression into a
+   * finite state machine.
+   */
+  static const error_type error_space(_S_error_space);
+
+  /**
+   * One of <em>*?+{<em> was not preceded by a valid regular expression.
+   */
+  static const error_type error_badrepeat(_S_error_badrepeat);
+
+  /**
+   * The complexity of an attempted match against a regular expression
+   * exceeded a pre-set level.
+   */
+  static const error_type error_complexity(_S_error_complexity);
+
+  /**
+   * There was insufficient memory to determine whether the
+   * regular expression could match the specified character sequence.
+   */
+  static const error_type error_stack(_S_error_stack);
+
+  //@}
+}
+
+  // [7.8] Class regex_error
+  /**
+   * @brief A regular expression exception class.
+   * @ingroup exceptions
+   *
+   * The regular expression library throws objects of this class on error.
+   */
+  class regex_error
+  : public std::runtime_error
+  {
+  public:
+    /**
+     * @brief Constructs a regex_error object.
+     *
+     * @param ecode the regex error code.
+     */
+    explicit
+    regex_error(regex_constants::error_type __ecode)
+    : std::runtime_error("regex_error"), _M_code(__ecode)
+    { }
+
+    /**
+     * @brief Gets the regex error code.
+     *
+     * @returns the regex error code.
+     */
+    regex_constants::error_type
+    code() const
+    { return _M_code; }
+
+  protected:
+    regex_constants::error_type _M_code;
+  };
+
+
+  inline void
+  __throw_regex_error(regex_constants::error_type __ecode)
+  { throw regex_error(__ecode); }
+
+} // namespace std
+