FM / bits

/usr/include/c++/9/bits

Name	Size	Mode	Actions
algorithmfwd.h	21737	0644	edit dl rm
allocated_ptr.h	3293	0644	edit dl rm
allocator.h	7942	0644	edit dl rm
alloc_traits.h	21481	0644	edit dl rm
atomic_base.h	24993	0644	edit dl rm
atomic_futex.h	9499	0644	edit dl rm
atomic_lockfree_defines.h	2353	0644	edit dl rm
basic_ios.h	16080	0644	edit dl rm
basic_ios.tcc	6083	0644	edit dl rm
basic_string.h	247075	0644	edit dl rm
basic_string.tcc	53891	0644	edit dl rm
boost_concept_check.h	27161	0644	edit dl rm
c++0x_warning.h	1474	0644	edit dl rm
char_traits.h	24828	0644	edit dl rm
codecvt.h	25429	0644	edit dl rm
concept_check.h	3423	0644	edit dl rm
cpp_type_traits.h	9947	0644	edit dl rm
cxxabi_forced.h	1811	0644	edit dl rm
cxxabi_init_exception.h	2220	0644	edit dl rm
deque.tcc	34404	0644	edit dl rm
enable_special_members.h	12387	0644	edit dl rm
erase_if.h	2037	0644	edit dl rm
exception.h	2486	0644	edit dl rm
exception_defines.h	1645	0644	edit dl rm
exception_ptr.h	5982	0644	edit dl rm
forward_list.h	49405	0644	edit dl rm
forward_list.tcc	13871	0644	edit dl rm
fstream.tcc	33663	0644	edit dl rm
fs_dir.h	15168	0644	edit dl rm
fs_fwd.h	11687	0644	edit dl rm
fs_ops.h	9731	0644	edit dl rm
fs_path.h	36954	0644	edit dl rm
functexcept.h	3433	0644	edit dl rm
functional_hash.h	8568	0644	edit dl rm
gslice.h	5519	0644	edit dl rm
gslice_array.h	7852	0644	edit dl rm
hashtable.h	74814	0644	edit dl rm
hashtable_policy.h	68109	0644	edit dl rm
hash_bytes.h	2146	0644	edit dl rm
indirect_array.h	7862	0644	edit dl rm
invoke.h	3657	0644	edit dl rm
ios_base.h	31434	0644	edit dl rm
istream.tcc	31093	0644	edit dl rm
list.tcc	16968	0644	edit dl rm
localefwd.h	5941	0644	edit dl rm
locale_classes.h	24903	0644	edit dl rm
locale_classes.tcc	8375	0644	edit dl rm
locale_conv.h	18801	0644	edit dl rm
locale_facets.h	92339	0644	edit dl rm
locale_facets.tcc	39548	0644	edit dl rm
locale_facets_nonio.h	68994	0644	edit dl rm
locale_facets_nonio.tcc	45280	0644	edit dl rm
mask_array.h	7676	0644	edit dl rm
memoryfwd.h	2453	0644	edit dl rm
move.h	6529	0644	edit dl rm
nested_exception.h	4803	0644	edit dl rm
node_handle.h	8216	0644	edit dl rm
ostream.tcc	12315	0644	edit dl rm
ostream_insert.h	4002	0644	edit dl rm
parse_numbers.h	7944	0644	edit dl rm
postypes.h	8465	0644	edit dl rm
predefined_ops.h	9083	0644	edit dl rm
ptr_traits.h	6728	0644	edit dl rm
quoted_string.h	5053	0644	edit dl rm
random.h	178041	0644	edit dl rm
random.tcc	105619	0644	edit dl rm
range_access.h	10084	0644	edit dl rm
refwrap.h	12927	0644	edit dl rm
regex.h	98707	0644	edit dl rm
regex.tcc	16574	0644	edit dl rm
regex_automaton.h	10739	0644	edit dl rm
regex_automaton.tcc	7722	0644	edit dl rm
regex_compiler.h	16482	0644	edit dl rm
regex_compiler.tcc	18929	0644	edit dl rm
regex_constants.h	14707	0644	edit dl rm
regex_error.h	4907	0644	edit dl rm
regex_executor.h	7489	0644	edit dl rm
regex_executor.tcc	18841	0644	edit dl rm
regex_scanner.h	7089	0644	edit dl rm
regex_scanner.tcc	15009	0644	edit dl rm
shared_ptr.h	24221	0644	edit dl rm
shared_ptr_atomic.h	9775	0644	edit dl rm
shared_ptr_base.h	53771	0644	edit dl rm
slice_array.h	9430	0644	edit dl rm
specfun.h	47052	0644	edit dl rm
sstream.tcc	10142	0644	edit dl rm
std_abs.h	3384	0644	edit dl rm
std_function.h	23566	0644	edit dl rm
std_mutex.h	4768	0644	edit dl rm
stl_algo.h	215416	0644	edit dl rm
stl_algobase.h	51417	0644	edit dl rm
stl_bvector.h	33888	0644	edit dl rm
stl_construct.h	7397	0644	edit dl rm
stl_deque.h	80116	0644	edit dl rm
stl_function.h	42293	0644	edit dl rm
stl_heap.h	20206	0644	edit dl rm
stl_iterator.h	42755	0644	edit dl rm
stl_iterator_base_funcs.h	8178	0644	edit dl rm
stl_iterator_base_types.h	8682	0644	edit dl rm
stl_list.h	67809	0644	edit dl rm
stl_map.h	53495	0644	edit dl rm
stl_multimap.h	42240	0644	edit dl rm
stl_multiset.h	36486	0644	edit dl rm
stl_numeric.h	14376	0644	edit dl rm
stl_pair.h	18642	0644	edit dl rm
stl_queue.h	24580	0644	edit dl rm
stl_raw_storage_iter.h	3830	0644	edit dl rm
stl_relops.h	4594	0644	edit dl rm
stl_set.h	36790	0644	edit dl rm
stl_stack.h	12228	0644	edit dl rm
stl_tempbuf.h	8287	0644	edit dl rm
stl_tree.h	75018	0644	edit dl rm
stl_uninitialized.h	31455	0644	edit dl rm
stl_vector.h	64968	0644	edit dl rm
streambuf.tcc	4929	0644	edit dl rm
streambuf_iterator.h	13889	0644	edit dl rm
stream_iterator.h	6867	0644	edit dl rm
stringfwd.h	2690	0644	edit dl rm
string_view.tcc	6698	0644	edit dl rm
uniform_int_dist.h	10248	0644	edit dl rm
unique_lock.h	6102	0644	edit dl rm
unique_ptr.h	27564	0644	edit dl rm
unordered_map.h	76884	0644	edit dl rm
unordered_set.h	60677	0644	edit dl rm
uses_allocator.h	6824	0644	edit dl rm
valarray_after.h	22839	0644	edit dl rm
valarray_array.h	21295	0644	edit dl rm
valarray_array.tcc	7254	0644	edit dl rm
valarray_before.h	19142	0644	edit dl rm
vector.tcc	30870	0644	edit dl rm

Edit: /usr/include/c++/9/bits/regex_scanner.h (7089B)

// class template regex -*- C++ -*-

// Copyright (C) 2013-2019 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_scanner.h
 *  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)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace __detail
{
  /**
   * @addtogroup regex-detail
   * @{
   */

struct _ScannerBase
  {
  public:
    /// Token types returned from the scanner.
    enum _TokenT : unsigned
    {
      _S_token_anychar,
      _S_token_ord_char,
      _S_token_oct_num,
      _S_token_hex_num,
      _S_token_backref,
      _S_token_subexpr_begin,
      _S_token_subexpr_no_group_begin,
      _S_token_subexpr_lookahead_begin, // neg if _M_value[0] == 'n'
      _S_token_subexpr_end,
      _S_token_bracket_begin,
      _S_token_bracket_neg_begin,
      _S_token_bracket_end,
      _S_token_interval_begin,
      _S_token_interval_end,
      _S_token_quoted_class,
      _S_token_char_class_name,
      _S_token_collsymbol,
      _S_token_equiv_class_name,
      _S_token_opt,
      _S_token_or,
      _S_token_closure0,
      _S_token_closure1,
      _S_token_line_begin,
      _S_token_line_end,
      _S_token_word_bound, // neg if _M_value[0] == 'n'
      _S_token_comma,
      _S_token_dup_count,
      _S_token_eof,
      _S_token_bracket_dash,
      _S_token_unknown = -1u
    };

protected:
    typedef regex_constants::syntax_option_type _FlagT;

enum _StateT
    {
      _S_state_normal,
      _S_state_in_brace,
      _S_state_in_bracket,
    };

protected:
    _ScannerBase(_FlagT __flags)
    : _M_state(_S_state_normal),
    _M_flags(__flags),
    _M_escape_tbl(_M_is_ecma()
		  ? _M_ecma_escape_tbl
		  : _M_awk_escape_tbl),
    _M_spec_char(_M_is_ecma()
		 ? _M_ecma_spec_char
		 : _M_flags & regex_constants::basic
		 ? _M_basic_spec_char
		 : _M_flags & regex_constants::extended
		 ? _M_extended_spec_char
		 : _M_flags & regex_constants::grep
		 ?  ".[\\*^$\n"
		 : _M_flags & regex_constants::egrep
		 ? ".[\\()*+?{|^$\n"
		 : _M_flags & regex_constants::awk
		 ? _M_extended_spec_char
		 : nullptr),
    _M_at_bracket_start(false)
    { __glibcxx_assert(_M_spec_char); }

protected:
    const char*
    _M_find_escape(char __c)
    {
      auto __it = _M_escape_tbl;
      for (; __it->first != '\0'; ++__it)
	if (__it->first == __c)
	  return &__it->second;
      return nullptr;
    }

bool
    _M_is_ecma() const
    { return _M_flags & regex_constants::ECMAScript; }

bool
    _M_is_basic() const
    { return _M_flags & (regex_constants::basic | regex_constants::grep); }

bool
    _M_is_extended() const
    {
      return _M_flags & (regex_constants::extended
			 | regex_constants::egrep
			 | regex_constants::awk);
    }

bool
    _M_is_grep() const
    { return _M_flags & (regex_constants::grep | regex_constants::egrep); }

bool
    _M_is_awk() const
    { return _M_flags & regex_constants::awk; }

protected:
    // TODO: Make them static in the next abi change.
    const std::pair<char, _TokenT> _M_token_tbl[9] =
      {
	{'^', _S_token_line_begin},
	{'$', _S_token_line_end},
	{'.', _S_token_anychar},
	{'*', _S_token_closure0},
	{'+', _S_token_closure1},
	{'?', _S_token_opt},
	{'|', _S_token_or},
	{'\n', _S_token_or}, // grep and egrep
	{'\0', _S_token_or},
      };
    const std::pair<char, char> _M_ecma_escape_tbl[8] =
      {
	{'0', '\0'},
	{'b', '\b'},
	{'f', '\f'},
	{'n', '\n'},
	{'r', '\r'},
	{'t', '\t'},
	{'v', '\v'},
	{'\0', '\0'},
      };
    const std::pair<char, char> _M_awk_escape_tbl[11] =
      {
	{'"', '"'},
	{'/', '/'},
	{'\\', '\\'},
	{'a', '\a'},
	{'b', '\b'},
	{'f', '\f'},
	{'n', '\n'},
	{'r', '\r'},
	{'t', '\t'},
	{'v', '\v'},
	{'\0', '\0'},
      };
    const char* _M_ecma_spec_char = "^$\\.*+?()[]{}|";
    const char* _M_basic_spec_char = ".[\\*^$";
    const char* _M_extended_spec_char = ".[\\()*+?{|^$";

_StateT                       _M_state;
    _FlagT                        _M_flags;
    _TokenT                       _M_token;
    const std::pair<char, char>*  _M_escape_tbl;
    const char*                   _M_spec_char;
    bool                          _M_at_bracket_start;
  };

/**
   * @brief Scans an input range for regex tokens.
   *
   * The %_Scanner class interprets the regular expression pattern in
   * the input range passed to its constructor as a sequence of parse
   * tokens passed to the regular expression compiler.  The sequence
   * of tokens provided depends on the flag settings passed to the
   * constructor: different regular expression grammars will interpret
   * the same input pattern in syntactically different ways.
   */
  template<typename _CharT>
    class _Scanner
    : public _ScannerBase
    {
    public:
      typedef const _CharT*                                       _IterT;
      typedef std::basic_string<_CharT>                           _StringT;
      typedef regex_constants::syntax_option_type                 _FlagT;
      typedef const std::ctype<_CharT>                            _CtypeT;

_Scanner(_IterT __begin, _IterT __end,
	       _FlagT __flags, std::locale __loc);

void
      _M_advance();

_TokenT
      _M_get_token() const
      { return _M_token; }

const _StringT&
      _M_get_value() const
      { return _M_value; }

#ifdef _GLIBCXX_DEBUG
      std::ostream&
      _M_print(std::ostream&);
#endif

private:
      void
      _M_scan_normal();

void
      _M_scan_in_bracket();

void
      _M_scan_in_brace();

void
      _M_eat_escape_ecma();

void
      _M_eat_escape_posix();

void
      _M_eat_escape_awk();

void
      _M_eat_class(char);

_IterT                        _M_current;
      _IterT                        _M_end;
      _CtypeT&                      _M_ctype;
      _StringT                      _M_value;
      void (_Scanner::* _M_eat_escape)();
    };

///@} regex-detail
} // namespace __detail
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#include <bits/regex_scanner.tcc>

cmd: