1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Standards Conformance</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../index.html" title="Boost.Regex 5.1.4"> 8<link rel="up" href="../background.html" title="Background Information"> 9<link rel="prev" href="performance/section_id4148872883.html" title="Testing leftmost-longest searches (platform = linux, compiler = GNU C++ version 6.3.0)"> 10<link rel="next" href="redist.html" title="Redistributables"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="performance/section_id4148872883.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../background.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="redist.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_regex.background.standards"></a><a class="link" href="standards.html" title="Standards Conformance">Standards Conformance</a> 28</h3></div></div></div> 29<h5> 30<a name="boost_regex.background.standards.h0"></a> 31 <span class="phrase"><a name="boost_regex.background.standards.c"></a></span><a class="link" href="standards.html#boost_regex.background.standards.c">C++</a> 32 </h5> 33<p> 34 Boost.Regex is intended to conform to the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Technical 35 Report on C++ Library Extensions</a>. 36 </p> 37<h5> 38<a name="boost_regex.background.standards.h1"></a> 39 <span class="phrase"><a name="boost_regex.background.standards.ecmascript_javascript"></a></span><a class="link" href="standards.html#boost_regex.background.standards.ecmascript_javascript">ECMAScript 40 / JavaScript</a> 41 </h5> 42<p> 43 All of the ECMAScript regular expression syntax features are supported, except 44 that: 45 </p> 46<p> 47 The escape sequence \u matches any upper case character (the same as [[:upper:]]) 48 rather than a Unicode escape sequence; use \x{DDDD} for Unicode escape sequences. 49 </p> 50<h5> 51<a name="boost_regex.background.standards.h2"></a> 52 <span class="phrase"><a name="boost_regex.background.standards.perl"></a></span><a class="link" href="standards.html#boost_regex.background.standards.perl">Perl</a> 53 </h5> 54<p> 55 Almost all Perl features are supported, except for: 56 </p> 57<p> 58 (?{code}) Not implementable in a compiled strongly typed language. 59 </p> 60<p> 61 (??{code}) Not implementable in a compiled strongly typed language. 62 </p> 63<p> 64 (*VERB) The <a href="http://perldoc.perl.org/perlre.html#Special-Backtracking-Control-Verbs" target="_top">backtracking 65 control verbs</a> are not recognised or implemented at this time. 66 </p> 67<p> 68 In addition the following features behave slightly differently from Perl: 69 </p> 70<p> 71 ^ $ \Z These recognise any line termination sequence, and not just \n: see 72 the Unicode requirements below. 73 </p> 74<h5> 75<a name="boost_regex.background.standards.h3"></a> 76 <span class="phrase"><a name="boost_regex.background.standards.posix"></a></span><a class="link" href="standards.html#boost_regex.background.standards.posix">POSIX</a> 77 </h5> 78<p> 79 All the POSIX basic and extended regular expression features are supported, 80 except that: 81 </p> 82<p> 83 No character collating names are recognized except those specified in the 84 POSIX standard for the C locale, unless they are explicitly registered with 85 the traits class. 86 </p> 87<p> 88 Character equivalence classes ( [[=a=]] etc) are probably buggy except on 89 Win32. Implementing this feature requires knowledge of the format of the 90 string sort keys produced by the system; if you need this, and the default 91 implementation doesn't work on your platform, then you will need to supply 92 a custom traits class. 93 </p> 94<h5> 95<a name="boost_regex.background.standards.h4"></a> 96 <span class="phrase"><a name="boost_regex.background.standards.unicode"></a></span><a class="link" href="standards.html#boost_regex.background.standards.unicode">Unicode</a> 97 </h5> 98<p> 99 The following comments refer to <a href="http://unicode.org/reports/tr18/" target="_top">Unicode 100 Technical Standard #18: Unicode Regular Expressions version 11</a>. 101 </p> 102<div class="informaltable"><table class="table"> 103<colgroup> 104<col> 105<col> 106<col> 107</colgroup> 108<thead><tr> 109<th> 110 <p> 111 Item 112 </p> 113 </th> 114<th> 115 <p> 116 Feature 117 </p> 118 </th> 119<th> 120 <p> 121 Support 122 </p> 123 </th> 124</tr></thead> 125<tbody> 126<tr> 127<td> 128 <p> 129 1.1 130 </p> 131 </td> 132<td> 133 <p> 134 Hex Notation 135 </p> 136 </td> 137<td> 138 <p> 139 Yes: use \x{DDDD} to refer to code point UDDDD. 140 </p> 141 </td> 142</tr> 143<tr> 144<td> 145 <p> 146 1.2 147 </p> 148 </td> 149<td> 150 <p> 151 Character Properties 152 </p> 153 </td> 154<td> 155 <p> 156 All the names listed under the General Category Property are supported. 157 Script names and Other Names are not currently supported. 158 </p> 159 </td> 160</tr> 161<tr> 162<td> 163 <p> 164 1.3 165 </p> 166 </td> 167<td> 168 <p> 169 Subtraction and Intersection 170 </p> 171 </td> 172<td> 173 <p> 174 Indirectly support by forward-lookahead: 175 </p> 176 <p> 177 <code class="computeroutput"><span class="special">(?=[[:</span><span class="identifier">X</span><span class="special">:]])[[:</span><span class="identifier">Y</span><span class="special">:]]</span></code> 178 </p> 179 <p> 180 Gives the intersection of character properties X and Y. 181 </p> 182 <p> 183 <code class="computeroutput"><span class="special">(?![[:</span><span class="identifier">X</span><span class="special">:]])[[:</span><span class="identifier">Y</span><span class="special">:]]</span></code> 184 </p> 185 <p> 186 Gives everything in Y that is not in X (subtraction). 187 </p> 188 </td> 189</tr> 190<tr> 191<td> 192 <p> 193 1.4 194 </p> 195 </td> 196<td> 197 <p> 198 Simple Word Boundaries 199 </p> 200 </td> 201<td> 202 <p> 203 Conforming: non-spacing marks are included in the set of word characters. 204 </p> 205 </td> 206</tr> 207<tr> 208<td> 209 <p> 210 1.5 211 </p> 212 </td> 213<td> 214 <p> 215 Caseless Matching 216 </p> 217 </td> 218<td> 219 <p> 220 Supported, note that at this level, case transformations are 1:1, 221 many to many case folding operations are not supported (for example 222 "ß" to "SS"). 223 </p> 224 </td> 225</tr> 226<tr> 227<td> 228 <p> 229 1.6 230 </p> 231 </td> 232<td> 233 <p> 234 Line Boundaries 235 </p> 236 </td> 237<td> 238 <p> 239 Supported, except that "." matches only one character 240 of "\r\n". Other than that word boundaries match correctly; 241 including not matching in the middle of a "\r\n" sequence. 242 </p> 243 </td> 244</tr> 245<tr> 246<td> 247 <p> 248 1.7 249 </p> 250 </td> 251<td> 252 <p> 253 Code Points 254 </p> 255 </td> 256<td> 257 <p> 258 Supported: provided you use the u32* algorithms, then UTF-8, UTF-16 259 and UTF-32 are all treated as sequences of 32-bit code points. 260 </p> 261 </td> 262</tr> 263<tr> 264<td> 265 <p> 266 2.1 267 </p> 268 </td> 269<td> 270 <p> 271 Canonical Equivalence 272 </p> 273 </td> 274<td> 275 <p> 276 Not supported: it is up to the user of the library to convert all 277 text into the same canonical form as the regular expression. 278 </p> 279 </td> 280</tr> 281<tr> 282<td> 283 <p> 284 2.2 285 </p> 286 </td> 287<td> 288 <p> 289 Default Grapheme Clusters 290 </p> 291 </td> 292<td> 293 <p> 294 Not supported. 295 </p> 296 </td> 297</tr> 298<tr> 299<td> 300 <p> 301 2.3Default Word Boundaries 302 </p> 303 </td> 304<td> 305 <p> 306 Not supported. 307 </p> 308 </td> 309<td class="auto-generated"> </td> 310</tr> 311<tr> 312<td> 313 <p> 314 2.4 315 </p> 316 </td> 317<td> 318 <p> 319 Default Loose Matches 320 </p> 321 </td> 322<td> 323 <p> 324 Not Supported. 325 </p> 326 </td> 327</tr> 328<tr> 329<td> 330 <p> 331 2.5 332 </p> 333 </td> 334<td> 335 <p> 336 Named Properties 337 </p> 338 </td> 339<td> 340 <p> 341 Supported: the expression "[[:name:]]" or \N{name} matches 342 the named character "name". 343 </p> 344 </td> 345</tr> 346<tr> 347<td> 348 <p> 349 2.6 350 </p> 351 </td> 352<td> 353 <p> 354 Wildcard properties 355 </p> 356 </td> 357<td> 358 <p> 359 Not Supported. 360 </p> 361 </td> 362</tr> 363<tr> 364<td> 365 <p> 366 3.1 367 </p> 368 </td> 369<td> 370 <p> 371 Tailored Punctuation. 372 </p> 373 </td> 374<td> 375 <p> 376 Not Supported. 377 </p> 378 </td> 379</tr> 380<tr> 381<td> 382 <p> 383 3.2 384 </p> 385 </td> 386<td> 387 <p> 388 Tailored Grapheme Clusters 389 </p> 390 </td> 391<td> 392 <p> 393 Not Supported. 394 </p> 395 </td> 396</tr> 397<tr> 398<td> 399 <p> 400 3.3 401 </p> 402 </td> 403<td> 404 <p> 405 Tailored Word Boundaries. 406 </p> 407 </td> 408<td> 409 <p> 410 Not Supported. 411 </p> 412 </td> 413</tr> 414<tr> 415<td> 416 <p> 417 3.4 418 </p> 419 </td> 420<td> 421 <p> 422 Tailored Loose Matches 423 </p> 424 </td> 425<td> 426 <p> 427 Partial support: [[=c=]] matches characters with the same primary 428 equivalence class as "c". 429 </p> 430 </td> 431</tr> 432<tr> 433<td> 434 <p> 435 3.5 436 </p> 437 </td> 438<td> 439 <p> 440 Tailored Ranges 441 </p> 442 </td> 443<td> 444 <p> 445 Supported: [a-b] matches any character that collates in the range 446 a to b, when the expression is constructed with the collate flag 447 set. 448 </p> 449 </td> 450</tr> 451<tr> 452<td> 453 <p> 454 3.6 455 </p> 456 </td> 457<td> 458 <p> 459 Context Matches 460 </p> 461 </td> 462<td> 463 <p> 464 Not Supported. 465 </p> 466 </td> 467</tr> 468<tr> 469<td> 470 <p> 471 3.7 472 </p> 473 </td> 474<td> 475 <p> 476 Incremental Matches 477 </p> 478 </td> 479<td> 480 <p> 481 Supported: pass the flag <code class="computeroutput"><span class="identifier">match_partial</span></code> 482 to the regex algorithms. 483 </p> 484 </td> 485</tr> 486<tr> 487<td> 488 <p> 489 3.8 490 </p> 491 </td> 492<td> 493 <p> 494 Unicode Set Sharing 495 </p> 496 </td> 497<td> 498 <p> 499 Not Supported. 500 </p> 501 </td> 502</tr> 503<tr> 504<td> 505 <p> 506 3.9 507 </p> 508 </td> 509<td> 510 <p> 511 Possible Match Sets 512 </p> 513 </td> 514<td> 515 <p> 516 Not supported, however this information is used internally to optimise 517 the matching of regular expressions, and return quickly if no match 518 is possible. 519 </p> 520 </td> 521</tr> 522<tr> 523<td> 524 <p> 525 3.10 526 </p> 527 </td> 528<td> 529 <p> 530 Folded Matching 531 </p> 532 </td> 533<td> 534 <p> 535 Partial Support: It is possible to achieve a similar effect by 536 using a custom regular expression traits class. 537 </p> 538 </td> 539</tr> 540<tr> 541<td> 542 <p> 543 3.11 544 </p> 545 </td> 546<td> 547 <p> 548 Custom Submatch Evaluation 549 </p> 550 </td> 551<td> 552 <p> 553 Not Supported. 554 </p> 555 </td> 556</tr> 557</tbody> 558</table></div> 559</div> 560<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 561<td align="left"></td> 562<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> 563 Distributed under the Boost Software License, Version 1.0. (See accompanying 564 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 565 </p> 566</div></td> 567</tr></table> 568<hr> 569<div class="spirit-nav"> 570<a accesskey="p" href="performance/section_id4148872883.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../background.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="redist.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 571</div> 572</body> 573</html> 574
