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The C and C++ Include Header Files
/usr/include/c++/11/bits/regex_constants.h
$ cat -n /usr/include/c++/11/bits/regex_constants.h 1 // class template regex -*- C++ -*- 2 3 // Copyright (C) 2010-2021 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** 26 * @file bits/regex_constants.h 27 * @brief Constant definitions for the std regex library. 28 * 29 * This is an internal header file, included by other library headers. 30 * Do not attempt to use it directly. @headername{regex} 31 */ 32 33 namespace std _GLIBCXX_VISIBILITY(default) 34 { 35 _GLIBCXX_BEGIN_NAMESPACE_VERSION 36 37 /** 38 * @defgroup regex Regular Expressions 39 * 40 * A facility for performing regular expression pattern matching. 41 * @{ 42 */ 43 44 /** 45 * @namespace std::regex_constants 46 * @brief ISO C++ 2011 namespace for options and flags used with std::regex 47 */ 48 namespace regex_constants 49 { 50 /** 51 * @name 5.1 Regular Expression Syntax Options 52 */ 53 ///@{ 54 enum __syntax_option 55 { 56 _S_icase, 57 _S_nosubs, 58 _S_optimize, 59 _S_collate, 60 _S_ECMAScript, 61 _S_basic, 62 _S_extended, 63 _S_awk, 64 _S_grep, 65 _S_egrep, 66 _S_polynomial, 67 _S_multiline 68 }; 69 70 /** 71 * @brief This is a bitmask type indicating how to interpret the regex. 72 * 73 * The @c syntax_option_type is implementation defined but it is valid to 74 * perform bitwise operations on these values and expect the right thing to 75 * happen. 76 * 77 * A valid value of type syntax_option_type shall have exactly one of the 78 * elements @c ECMAScript, @c basic, @c extended, @c awk, @c grep, @c egrep 79 * %set. 80 */ 81 enum syntax_option_type : unsigned int { }; 82 83 /** 84 * Specifies that the matching of regular expressions against a character 85 * sequence shall be performed without regard to case. 86 */ 87 _GLIBCXX17_INLINE constexpr syntax_option_type icase = 88 static_cast<syntax_option_type>(1 << _S_icase); 89 90 /** 91 * Specifies that when a regular expression is matched against a character 92 * container sequence, no sub-expression matches are to be stored in the 93 * supplied match_results structure. 94 */ 95 _GLIBCXX17_INLINE constexpr syntax_option_type nosubs = 96 static_cast<syntax_option_type>(1 << _S_nosubs); 97 98 /** 99 * Specifies that the regular expression engine should pay more attention to 100 * the speed with which regular expressions are matched, and less to the 101 * speed with which regular expression objects are constructed. Otherwise 102 * it has no detectable effect on the program output. 103 */ 104 _GLIBCXX17_INLINE constexpr syntax_option_type optimize = 105 static_cast<syntax_option_type>(1 << _S_optimize); 106 107 /** 108 * Specifies that character ranges of the form [a-b] should be locale 109 * sensitive. 110 */ 111 _GLIBCXX17_INLINE constexpr syntax_option_type collate = 112 static_cast<syntax_option_type>(1 << _S_collate); 113 114 /** 115 * Specifies that the grammar recognized by the regular expression engine is 116 * that used by ECMAScript in ECMA-262 [Ecma International, ECMAScript 117 * Language Specification, Standard Ecma-262, third edition, 1999], as 118 * modified in section [28.13]. This grammar is similar to that defined 119 * in the PERL scripting language but extended with elements found in the 120 * POSIX regular expression grammar. 121 */ 122 _GLIBCXX17_INLINE constexpr syntax_option_type ECMAScript = 123 static_cast<syntax_option_type>(1 << _S_ECMAScript); 124 125 /** 126 * Specifies that the grammar recognized by the regular expression engine is 127 * that used by POSIX basic regular expressions in IEEE Std 1003.1-2001, 128 * Portable Operating System Interface (POSIX), Base Definitions and 129 * Headers, Section 9, Regular Expressions [IEEE, Information Technology -- 130 * Portable Operating System Interface (POSIX), IEEE Standard 1003.1-2001]. 131 */ 132 _GLIBCXX17_INLINE constexpr syntax_option_type basic = 133 static_cast<syntax_option_type>(1 << _S_basic); 134 135 /** 136 * Specifies that the grammar recognized by the regular expression engine is 137 * that used by POSIX extended regular expressions in IEEE Std 1003.1-2001, 138 * Portable Operating System Interface (POSIX), Base Definitions and 139 * Headers, Section 9, Regular Expressions. 140 */ 141 _GLIBCXX17_INLINE constexpr syntax_option_type extended = 142 static_cast<syntax_option_type>(1 << _S_extended); 143 144 /** 145 * Specifies that the grammar recognized by the regular expression engine is 146 * that used by POSIX utility awk in IEEE Std 1003.1-2001. This option is 147 * identical to syntax_option_type extended, except that C-style escape 148 * sequences are supported. These sequences are: 149 * \\\\, \\a, \\b, \\f, \\n, \\r, \\t , \\v, \\&apos,, &apos,, 150 * and \\ddd (where ddd is one, two, or three octal digits). 151 */ 152 _GLIBCXX17_INLINE constexpr syntax_option_type awk = 153 static_cast<syntax_option_type>(1 << _S_awk); 154 155 /** 156 * Specifies that the grammar recognized by the regular expression engine is 157 * that used by POSIX utility grep in IEEE Std 1003.1-2001. This option is 158 * identical to syntax_option_type basic, except that newlines are treated 159 * as whitespace. 160 */ 161 _GLIBCXX17_INLINE constexpr syntax_option_type grep = 162 static_cast<syntax_option_type>(1 << _S_grep); 163 164 /** 165 * Specifies that the grammar recognized by the regular expression engine is 166 * that used by POSIX utility grep when given the -E option in 167 * IEEE Std 1003.1-2001. This option is identical to syntax_option_type 168 * extended, except that newlines are treated as whitespace. 169 */ 170 _GLIBCXX17_INLINE constexpr syntax_option_type egrep = 171 static_cast<syntax_option_type>(1 << _S_egrep); 172 173 #if __cplusplus >= 201703L || !defined __STRICT_ANSI__ 174 // _GLIBCXX_RESOLVE_LIB_DEFECTS 175 // 2503. multiline option should be added to syntax_option_type 176 /** 177 * Specifies that the `^` anchor matches at the beginning of a line, 178 * and the `$` anchor matches at the end of a line, not only at the 179 * beginning/end of the input. 180 * Valid for the ECMAScript syntax, ignored otherwise. 181 * @since C++17 182 */ 183 _GLIBCXX17_INLINE constexpr syntax_option_type multiline = 184 static_cast<syntax_option_type>(1 << _S_multiline); 185 #endif 186 187 /// Extension: Equivalent to regex_constants::multiline for C++11 and C++14. 188 _GLIBCXX17_INLINE constexpr syntax_option_type __multiline = 189 static_cast<syntax_option_type>(1 << _S_multiline); 190 191 /** 192 * Extension: Ensure both space complexity of compiled regex and 193 * time complexity execution are not exponential. 194 * If specified in a regex with back-references, the exception 195 * regex_constants::error_complexity will be thrown. 196 */ 197 _GLIBCXX17_INLINE constexpr syntax_option_type __polynomial = 198 static_cast<syntax_option_type>(1 << _S_polynomial); 199 200 constexpr inline syntax_option_type 201 operator&(syntax_option_type __a, syntax_option_type __b) 202 { 203 return (syntax_option_type)(static_cast<unsigned int>(__a) 204 & static_cast<unsigned int>(__b)); 205 } 206 207 constexpr inline syntax_option_type 208 operator|(syntax_option_type __a, syntax_option_type __b) 209 { 210 return (syntax_option_type)(static_cast<unsigned int>(__a) 211 | static_cast<unsigned int>(__b)); 212 } 213 214 constexpr inline syntax_option_type 215 operator^(syntax_option_type __a, syntax_option_type __b) 216 { 217 return (syntax_option_type)(static_cast<unsigned int>(__a) 218 ^ static_cast<unsigned int>(__b)); 219 } 220 221 constexpr inline syntax_option_type 222 operator~(syntax_option_type __a) 223 { return (syntax_option_type)(~static_cast<unsigned int>(__a)); } 224 225 inline syntax_option_type& 226 operator&=(syntax_option_type& __a, syntax_option_type __b) 227 { return __a = __a & __b; } 228 229 inline syntax_option_type& 230 operator|=(syntax_option_type& __a, syntax_option_type __b) 231 { return __a = __a | __b; } 232 233 inline syntax_option_type& 234 operator^=(syntax_option_type& __a, syntax_option_type __b) 235 { return __a = __a ^ __b; } 236 237 ///@} 238 239 /** 240 * @name 5.2 Matching Rules 241 * 242 * Matching a regular expression against a sequence of characters [first, 243 * last) proceeds according to the rules of the grammar specified for the 244 * regular expression object, modified according to the effects listed 245 * below for any bitmask elements set. 246 * 247 */ 248 ///@{ 249 250 enum __match_flag 251 { 252 _S_not_bol, 253 _S_not_eol, 254 _S_not_bow, 255 _S_not_eow, 256 _S_any, 257 _S_not_null, 258 _S_continuous, 259 _S_prev_avail, 260 _S_sed, 261 _S_no_copy, 262 _S_first_only, 263 _S_match_flag_last 264 }; 265 266 /** 267 * @brief This is a bitmask type indicating regex matching rules. 268 * 269 * The @c match_flag_type is implementation defined but it is valid to 270 * perform bitwise operations on these values and expect the right thing to 271 * happen. 272 */ 273 enum match_flag_type : unsigned int { }; 274 275 /** 276 * The default matching rules. 277 */ 278 _GLIBCXX17_INLINE constexpr match_flag_type match_default = 279 static_cast<match_flag_type>(0); 280 281 /** 282 * The first character in the sequence [first, last) is treated as though it 283 * is not at the beginning of a line, so the character (^) in the regular 284 * expression shall not match [first, first). 285 */ 286 _GLIBCXX17_INLINE constexpr match_flag_type match_not_bol = 287 static_cast<match_flag_type>(1 << _S_not_bol); 288 289 /** 290 * The last character in the sequence [first, last) is treated as though it 291 * is not at the end of a line, so the character ($) in the regular 292 * expression shall not match [last, last). 293 */ 294 _GLIBCXX17_INLINE constexpr match_flag_type match_not_eol = 295 static_cast<match_flag_type>(1 << _S_not_eol); 296 297 /** 298 * The expression \\b is not matched against the sub-sequence 299 * [first,first). 300 */ 301 _GLIBCXX17_INLINE constexpr match_flag_type match_not_bow = 302 static_cast<match_flag_type>(1 << _S_not_bow); 303 304 /** 305 * The expression \\b should not be matched against the sub-sequence 306 * [last,last). 307 */ 308 _GLIBCXX17_INLINE constexpr match_flag_type match_not_eow = 309 static_cast<match_flag_type>(1 << _S_not_eow); 310 311 /** 312 * If more than one match is possible then any match is an acceptable 313 * result. 314 */ 315 _GLIBCXX17_INLINE constexpr match_flag_type match_any = 316 static_cast<match_flag_type>(1 << _S_any); 317 318 /** 319 * The expression does not match an empty sequence. 320 */ 321 _GLIBCXX17_INLINE constexpr match_flag_type match_not_null = 322 static_cast<match_flag_type>(1 << _S_not_null); 323 324 /** 325 * The expression only matches a sub-sequence that begins at first . 326 */ 327 _GLIBCXX17_INLINE constexpr match_flag_type match_continuous = 328 static_cast<match_flag_type>(1 << _S_continuous); 329 330 /** 331 * `--first` is a valid iterator position. When this flag is set then the 332 * flags `match_not_bol` and `match_not_bow` are ignored by the algorithms 333 * `regex_match`, `regex_search`, and `regex_replace`, and by the iterators 334 * `regex_iterator` and `regex_token_iterator`. 335 */ 336 _GLIBCXX17_INLINE constexpr match_flag_type match_prev_avail = 337 static_cast<match_flag_type>(1 << _S_prev_avail); 338 339 /** 340 * When a regular expression match is to be replaced by a new string, the 341 * new string is constructed using the rules used by the ECMAScript replace 342 * function in ECMA- 262 [Ecma International, ECMAScript Language 343 * Specification, Standard Ecma-262, third edition, 1999], part 15.5.4.11 344 * String.prototype.replace. In addition, during search and replace 345 * operations all non-overlapping occurrences of the regular expression 346 * are located and replaced, and sections of the input that did not match 347 * the expression are copied unchanged to the output string. 348 * 349 * Format strings (from ECMA-262 [15.5.4.11]): 350 * @li $$ The dollar-sign itself ($) 351 * @li $& The matched substring. 352 * @li $` The portion of @a string that precedes the matched substring. 353 * This would be match_results::prefix(). 354 * @li $' The portion of @a string that follows the matched substring. 355 * This would be match_results::suffix(). 356 * @li $n The nth capture, where n is in [1,9] and $n is not followed by a 357 * decimal digit. If n <= match_results::size() and the nth capture 358 * is undefined, use the empty string instead. If n > 359 * match_results::size(), the result is implementation-defined. 360 * @li $nn The nnth capture, where nn is a two-digit decimal number on 361 * [01, 99]. If nn <= match_results::size() and the nth capture is 362 * undefined, use the empty string instead. If 363 * nn > match_results::size(), the result is implementation-defined. 364 */ 365 _GLIBCXX17_INLINE constexpr match_flag_type format_default = 366 static_cast<match_flag_type>(0); 367 368 /** 369 * When a regular expression match is to be replaced by a new string, the 370 * new string is constructed using the rules used by the POSIX sed utility 371 * in IEEE Std 1003.1- 2001 [IEEE, Information Technology -- Portable 372 * Operating System Interface (POSIX), IEEE Standard 1003.1-2001]. 373 */ 374 _GLIBCXX17_INLINE constexpr match_flag_type format_sed = 375 static_cast<match_flag_type>(1 << _S_sed); 376 377 /** 378 * During a search and replace operation, sections of the character 379 * container sequence being searched that do not match the regular 380 * expression shall not be copied to the output string. 381 */ 382 _GLIBCXX17_INLINE constexpr match_flag_type format_no_copy = 383 static_cast<match_flag_type>(1 << _S_no_copy); 384 385 /** 386 * When specified during a search and replace operation, only the first 387 * occurrence of the regular expression shall be replaced. 388 */ 389 _GLIBCXX17_INLINE constexpr match_flag_type format_first_only = 390 static_cast<match_flag_type>(1 << _S_first_only); 391 392 constexpr inline match_flag_type 393 operator&(match_flag_type __a, match_flag_type __b) 394 { 395 return (match_flag_type)(static_cast<unsigned int>(__a) 396 & static_cast<unsigned int>(__b)); 397 } 398 399 constexpr inline match_flag_type 400 operator|(match_flag_type __a, match_flag_type __b) 401 { 402 return (match_flag_type)(static_cast<unsigned int>(__a) 403 | static_cast<unsigned int>(__b)); 404 } 405 406 constexpr inline match_flag_type 407 operator^(match_flag_type __a, match_flag_type __b) 408 { 409 return (match_flag_type)(static_cast<unsigned int>(__a) 410 ^ static_cast<unsigned int>(__b)); 411 } 412 413 constexpr inline match_flag_type 414 operator~(match_flag_type __a) 415 { return (match_flag_type)(~static_cast<unsigned int>(__a)); } 416 417 inline match_flag_type& 418 operator&=(match_flag_type& __a, match_flag_type __b) 419 { return __a = __a & __b; } 420 421 inline match_flag_type& 422 operator|=(match_flag_type& __a, match_flag_type __b) 423 { return __a = __a | __b; } 424 425 inline match_flag_type& 426 operator^=(match_flag_type& __a, match_flag_type __b) 427 { return __a = __a ^ __b; } 428 429 ///@} 430 } // namespace regex_constants 431 /// @} group regex 432 433 _GLIBCXX_END_NAMESPACE_VERSION 434 } // namespace std 435
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