--- /dev/null
+// class template regex -*- C++ -*-
+
+// Copyright (C) 2010, 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.
+
+// 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_constants.h
+ * @brief Constant definitions for the std regex library.
+ *
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{regex}
+ */
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+/**
+ * @namespace std::regex_constants
+ * @brief ISO C++-0x entities sub namespace for regex.
+ */
+namespace regex_constants
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @name 5.1 Regular Expression Syntax Options
+ */
+ //@{
+ enum __syntax_option
+ {
+ _S_icase,
+ _S_nosubs,
+ _S_optimize,
+ _S_collate,
+ _S_ECMAScript,
+ _S_basic,
+ _S_extended,
+ _S_awk,
+ _S_grep,
+ _S_egrep,
+ _S_syntax_last
+ };
+
+ /**
+ * @brief This is a bitmask type indicating how to interpret the regex.
+ *
+ * The @c syntax_option_type is implementation defined but it is valid to
+ * perform bitwise operations on these values and expect the right thing to
+ * happen.
+ *
+ * A valid value of type syntax_option_type shall have exactly one of the
+ * elements @c ECMAScript, @c basic, @c extended, @c awk, @c grep, @c egrep
+ * %set.
+ */
+ typedef unsigned int syntax_option_type;
+
+ /**
+ * Specifies that the matching of regular expressions against a character
+ * sequence shall be performed without regard to case.
+ */
+ static constexpr syntax_option_type icase = 1 << _S_icase;
+
+ /**
+ * Specifies that when a regular expression is matched against a character
+ * container sequence, no sub-expression matches are to be stored in the
+ * supplied match_results structure.
+ */
+ static constexpr syntax_option_type nosubs = 1 << _S_nosubs;
+
+ /**
+ * Specifies that the regular expression engine should pay more attention to
+ * the speed with which regular expressions are matched, and less to the
+ * speed with which regular expression objects are constructed. Otherwise
+ * it has no detectable effect on the program output.
+ */
+ static constexpr syntax_option_type optimize = 1 << _S_optimize;
+
+ /**
+ * Specifies that character ranges of the form [a-b] should be locale
+ * sensitive.
+ */
+ static constexpr syntax_option_type collate = 1 << _S_collate;
+
+ /**
+ * Specifies that the grammar recognized by the regular expression engine is
+ * that used by ECMAScript in ECMA-262 [Ecma International, ECMAScript
+ * Language Specification, Standard Ecma-262, third edition, 1999], as
+ * modified in section [28.13]. This grammar is similar to that defined
+ * in the PERL scripting language but extended with elements found in the
+ * POSIX regular expression grammar.
+ */
+ static constexpr syntax_option_type ECMAScript = 1 << _S_ECMAScript;
+
+ /**
+ * Specifies that the grammar recognized by the regular expression engine is
+ * that used by POSIX basic regular expressions in IEEE Std 1003.1-2001,
+ * Portable Operating System Interface (POSIX), Base Definitions and
+ * Headers, Section 9, Regular Expressions [IEEE, Information Technology --
+ * Portable Operating System Interface (POSIX), IEEE Standard 1003.1-2001].
+ */
+ static constexpr syntax_option_type basic = 1 << _S_basic;
+
+ /**
+ * Specifies that the grammar recognized by the regular expression engine is
+ * that used by POSIX extended regular expressions in IEEE Std 1003.1-2001,
+ * Portable Operating System Interface (POSIX), Base Definitions and Headers,
+ * Section 9, Regular Expressions.
+ */
+ static constexpr syntax_option_type extended = 1 << _S_extended;
+
+ /**
+ * Specifies that the grammar recognized by the regular expression engine is
+ * that used by POSIX utility awk in IEEE Std 1003.1-2001. This option is
+ * identical to syntax_option_type extended, except that C-style escape
+ * sequences are supported. These sequences are:
+ * \\\\, \\a, \\b, \\f, \\n, \\r, \\t , \\v, \\', ',
+ * and \\ddd (where ddd is one, two, or three octal digits).
+ */
+ static constexpr syntax_option_type awk = 1 << _S_awk;
+
+ /**
+ * Specifies that the grammar recognized by the regular expression engine is
+ * that used by POSIX utility grep in IEEE Std 1003.1-2001. This option is
+ * identical to syntax_option_type basic, except that newlines are treated
+ * as whitespace.
+ */
+ static constexpr syntax_option_type grep = 1 << _S_grep;
+
+ /**
+ * Specifies that the grammar recognized by the regular expression engine is
+ * that used by POSIX utility grep when given the -E option in
+ * IEEE Std 1003.1-2001. This option is identical to syntax_option_type
+ * extended, except that newlines are treated as whitespace.
+ */
+ static constexpr syntax_option_type egrep = 1 << _S_egrep;
+
+ //@}
+
+ /**
+ * @name 5.2 Matching Rules
+ *
+ * Matching a regular expression against a sequence of characters [first,
+ * last) proceeds according to the rules of the grammar specified for the
+ * regular expression object, modified according to the effects listed
+ * below for any bitmask elements set.
+ *
+ */
+ //@{
+
+ enum __match_flag
+ {
+ _S_not_bol,
+ _S_not_eol,
+ _S_not_bow,
+ _S_not_eow,
+ _S_any,
+ _S_not_null,
+ _S_continuous,
+ _S_prev_avail,
+ _S_sed,
+ _S_no_copy,
+ _S_first_only,
+ _S_match_flag_last
+ };
+
+ /**
+ * @brief This is a bitmask type indicating regex matching rules.
+ *
+ * The @c match_flag_type is implementation defined but it is valid to
+ * perform bitwise operations on these values and expect the right thing to
+ * happen.
+ */
+ typedef std::bitset<_S_match_flag_last> match_flag_type;
+
+ /**
+ * The default matching rules.
+ */
+ static constexpr match_flag_type match_default = 0;
+
+ /**
+ * The first character in the sequence [first, last) is treated as though it
+ * is not at the beginning of a line, so the character (^) in the regular
+ * expression shall not match [first, first).
+ */
+ static constexpr match_flag_type match_not_bol = 1 << _S_not_bol;
+
+ /**
+ * The last character in the sequence [first, last) is treated as though it
+ * is not at the end of a line, so the character ($) in the regular
+ * expression shall not match [last, last).
+ */
+ static constexpr match_flag_type match_not_eol = 1 << _S_not_eol;
+
+ /**
+ * The expression \\b is not matched against the sub-sequence
+ * [first,first).
+ */
+ static constexpr match_flag_type match_not_bow = 1 << _S_not_bow;
+
+ /**
+ * The expression \\b should not be matched against the sub-sequence
+ * [last,last).
+ */
+ static constexpr match_flag_type match_not_eow = 1 << _S_not_eow;
+
+ /**
+ * If more than one match is possible then any match is an acceptable
+ * result.
+ */
+ static constexpr match_flag_type match_any = 1 << _S_any;
+
+ /**
+ * The expression does not match an empty sequence.
+ */
+ static constexpr match_flag_type match_not_null = 1 << _S_not_null;
+
+ /**
+ * The expression only matches a sub-sequence that begins at first .
+ */
+ static constexpr match_flag_type match_continuous = 1 << _S_continuous;
+
+ /**
+ * --first is a valid iterator position. When this flag is set then the
+ * flags match_not_bol and match_not_bow are ignored by the regular
+ * expression algorithms 28.11 and iterators 28.12.
+ */
+ static constexpr match_flag_type match_prev_avail = 1 << _S_prev_avail;
+
+ /**
+ * When a regular expression match is to be replaced by a new string, the
+ * new string is constructed using the rules used by the ECMAScript replace
+ * function in ECMA- 262 [Ecma International, ECMAScript Language
+ * Specification, Standard Ecma-262, third edition, 1999], part 15.5.4.11
+ * String.prototype.replace. In addition, during search and replace
+ * operations all non-overlapping occurrences of the regular expression
+ * are located and replaced, and sections of the input that did not match
+ * the expression are copied unchanged to the output string.
+ *
+ * Format strings (from ECMA-262 [15.5.4.11]):
+ * @li $$ The dollar-sign itself ($)
+ * @li $& The matched substring.
+ * @li $` The portion of @a string that precedes the matched substring.
+ * This would be match_results::prefix().
+ * @li $' The portion of @a string that follows the matched substring.
+ * This would be match_results::suffix().
+ * @li $n The nth capture, where n is in [1,9] and $n is not followed by a
+ * decimal digit. If n <= match_results::size() and the nth capture
+ * is undefined, use the empty string instead. If n >
+ * match_results::size(), the result is implementation-defined.
+ * @li $nn The nnth capture, where nn is a two-digit decimal number on
+ * [01, 99]. If nn <= match_results::size() and the nth capture is
+ * undefined, use the empty string instead. If
+ * nn > match_results::size(), the result is implementation-defined.
+ */
+ static constexpr match_flag_type format_default = 0;
+
+ /**
+ * When a regular expression match is to be replaced by a new string, the
+ * new string is constructed using the rules used by the POSIX sed utility
+ * in IEEE Std 1003.1- 2001 [IEEE, Information Technology -- Portable
+ * Operating System Interface (POSIX), IEEE Standard 1003.1-2001].
+ */
+ static constexpr match_flag_type format_sed = 1 << _S_sed;
+
+ /**
+ * During a search and replace operation, sections of the character
+ * container sequence being searched that do not match the regular
+ * expression shall not be copied to the output string.
+ */
+ static constexpr match_flag_type format_no_copy = 1 << _S_no_copy;
+
+ /**
+ * When specified during a search and replace operation, only the first
+ * occurrence of the regular expression shall be replaced.
+ */
+ static constexpr match_flag_type format_first_only = 1 << _S_first_only;
+
+ //@}
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace regex_constants
+} // namespace
+
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