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  24 <div class="section">
  25 <div class="titlepage"><div><div><h3 class="title">
  26 <a name="boost_regex.background.history"></a><a class="link" href="history.html" title="History">History</a>
  27 </h3></div></div></div>
  28 <p>
  29         New issues should be submitted at <a href="http://svn.boost.org" target="_top">svn.boost.org</a>
  30         - don't forget to include your email address in the ticket!
  31       </p>
  32 <p>
  33         Currently open issues can be viewed <a href="https://svn.boost.org/trac/boost/query?status=assigned&amp;status=new&amp;status=reopened&amp;component=regex&amp;order=priority&amp;col=id&amp;col=summary&amp;col=status&amp;col=type&amp;col=milestone&amp;col=component" target="_top">here</a>.
  34       </p>
  35 <p>
  36         All issues including closed ones can be viewed <a href="https://svn.boost.org/trac/boost/query?status=assigned&amp;status=closed&amp;status=new&amp;status=reopened&amp;component=regex&amp;order=priority&amp;col=id&amp;col=summary&amp;col=status&amp;col=type&amp;col=milestone&amp;col=component" target="_top">here</a>.
  37       </p>
  38 <h5>
  39 <a name="boost_regex.background.history.h0"></a>
  40         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_1_4_boost_172_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_1_4_boost_172_0">Boost.Regex-5.1.4
  41         (Boost-172.0)</a>
  42       </h5>
  43 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
  44             Minor build fixes, see <a href="https://github.com/boostorg/regex/issues/89" target="_top">#89</a>.
  45           </li></ul></div>
  46 <h5>
  47 <a name="boost_regex.background.history.h1"></a>
  48         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_1_3_boost_1_64_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_1_3_boost_1_64_0">Boost.Regex-5.1.3
  49         (Boost-1.64.0)</a>
  50       </h5>
  51 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  52 <li class="listitem">
  53             Compiling with Oracle C++ toolset is no longer restricted to static linking.
  54           </li>
  55 <li class="listitem">
  56             Big effort to de-fuzz the library using libFuzzer and fix identified
  57             issues, see: <a href="https://svn.boost.org/trac/boost/ticket/12818" target="_top">#12818</a>.
  58           </li>
  59 </ul></div>
  60 <h5>
  61 <a name="boost_regex.background.history.h2"></a>
  62         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_1_2_boost_1_62_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_1_2_boost_1_62_0">Boost.Regex-5.1.2
  63         (Boost-1.62.0)</a>
  64       </h5>
  65 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  66 <li class="listitem">
  67             Fix buffer over-run error when parsing certain invalid regexes, see
  68             <a href="https://svn.boost.org/trac/boost/ticket/12222" target="_top">#12222</a>.
  69           </li>
  70 <li class="listitem">
  71             Fix detection of ICU in library build, see <a href="https://svn.boost.org/trac/boost/ticket/12152" target="_top">#12152</a>.
  72           </li>
  73 <li class="listitem">
  74             Fix bug in case sensitivity change, see <a href="https://svn.boost.org/trac/boost/ticket/11940" target="_top">#11940</a>.
  75           </li>
  76 <li class="listitem">
  77             Allow types wider than int in <code class="computeroutput"><span class="special">\</span><span class="identifier">x</span><span class="special">{}</span></code>
  78             expressions (for char32_t etc), see <a href="https://svn.boost.org/trac/boost/ticket/11988" target="_top">#11988</a>.
  79           </li>
  80 </ul></div>
  81 <h5>
  82 <a name="boost_regex.background.history.h3"></a>
  83         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_1_1_boost_1_61_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_1_1_boost_1_61_0">Boost.Regex-5.1.1
  84         (Boost-1.61.0)</a>
  85       </h5>
  86 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
  87             Change to lockfree implementation of memory cache, see <a href="https://github.com/boostorg/regex/pull/23" target="_top">PR#23</a>.
  88           </li></ul></div>
  89 <h5>
  90 <a name="boost_regex.background.history.h4"></a>
  91         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_1_0_boost_1_60_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_1_0_boost_1_60_0">Boost.Regex-5.1.0
  92         (Boost-1.60.0)</a>
  93       </h5>
  94 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  95 <li class="listitem">
  96             Add support for Perl's backtracking control verbs, see <a href="https://svn.boost.org/trac/boost/ticket/11205" target="_top">#11205</a>.
  97             Note however, that (*MARK) and operations on marks are not currently
  98             supported.
  99           </li>
 100 <li class="listitem">
 101             Fix incorrect range end when matching [[:unicode:]], see <a href="https://svn.boost.org/trac/boost/ticket/11524" target="_top">#11524</a>.
 102           </li>
 103 <li class="listitem">
 104             Change POSIX reg_comp API to not check potentially uninitialized memory,
 105             note that code which was previously free from memory leaks (but none
 106             the less buggy, as it didn't call reg_free) will now leak. See <a href="https://svn.boost.org/trac/boost/ticket/11472" target="_top">#11472</a>.
 107           </li>
 108 <li class="listitem">
 109             Make sub_match a valid C++ range type, see <a href="https://svn.boost.org/trac/boost/ticket/11036" target="_top">#11036</a>.
 110           </li>
 111 </ul></div>
 112 <h5>
 113 <a name="boost_regex.background.history.h5"></a>
 114         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_0_1_boost_1_58_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_0_1_boost_1_58_0">Boost.Regex-5.0.1
 115         (Boost-1.58.0)</a>
 116       </h5>
 117 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 118 <li class="listitem">
 119             Fixed some typos as in <a href="https://svn.boost.org/trac/boost/ticket/10682" target="_top">#10682</a>.
 120           </li>
 121 <li class="listitem">
 122             Merged <a href="https://github.com/boostorg/regex/pull/6" target="_top">pull-request
 123             #6</a> for Coverity warnings.
 124           </li>
 125 <li class="listitem">
 126             Merged <a href="https://github.com/boostorg/regex/pull/7" target="_top">pull-request
 127             #7</a> for Coverity warnings.
 128           </li>
 129 <li class="listitem">
 130             Merged <a href="https://github.com/boostorg/regex/pull/8" target="_top">pull-request
 131             #8</a> for Coverity warnings.
 132           </li>
 133 <li class="listitem">
 134             Merged <a href="https://github.com/boostorg/regex/pull/10" target="_top">pull-request
 135             #10</a> to enable more build variants when linking to ICU.
 136           </li>
 137 <li class="listitem">
 138             Fix issue with ICU and partial matches, see <a href="https://svn.boost.org/trac/boost/ticket/10114" target="_top">#10114</a>.
 139           </li>
 140 <li class="listitem">
 141             Removed delayload support for the ICU libraries: this doesn't work with
 142             the latest ICU releases (linker errors).
 143           </li>
 144 </ul></div>
 145 <h5>
 146 <a name="boost_regex.background.history.h6"></a>
 147         <span class="phrase"><a name="boost_regex.background.history.boost_regex_5_0_0_boost_1_56_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_regex_5_0_0_boost_1_56_0">Boost.Regex-5.0.0
 148         (Boost-1.56.0)</a>
 149       </h5>
 150 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 151 <li class="listitem">
 152             Moved to library-specific version number post the move to Git. And since
 153             we have one (minor) breaking change this gets bumped up from v4 to v5.
 154           </li>
 155 <li class="listitem">
 156             <span class="bold"><strong>Breaking change:</strong></span> corrected behavior
 157             of <code class="computeroutput"><span class="identifier">basic_regex</span><span class="special">&lt;&gt;::</span><span class="identifier">mark_count</span><span class="special">()</span></code>
 158             to match existing documentation, <code class="computeroutput"><span class="identifier">basic_regex</span><span class="special">&lt;&gt;::</span><span class="identifier">subexpression</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code> changed to match, see <a href="https://svn.boost.org/trac/boost/ticket/9227" target="_top">#9227</a>
 159           </li>
 160 <li class="listitem">
 161             Fixed issue <a href="https://svn.boost.org/trac/boost/ticket/8903" target="_top">#8903</a>.
 162           </li>
 163 <li class="listitem">
 164             Fixed documentation typos from <a href="https://svn.boost.org/trac/boost/ticket/9283" target="_top">#9283</a>.
 165           </li>
 166 <li class="listitem">
 167             Fixed bug in collation code that failed if the locale generated collation
 168             strings with embedded nul's, see <a href="https://svn.boost.org/trac/boost/ticket/9451" target="_top">#9451</a>.
 169           </li>
 170 <li class="listitem">
 171             Apply patch for unusual thread usage (no statically initialized mutexes),
 172             see <a href="https://svn.boost.org/trac/boost/ticket/9461" target="_top">#9461</a>.
 173           </li>
 174 <li class="listitem">
 175             Added better checks for invalid UTF-8 sequences, see <a href="https://svn.boost.org/trac/boost/ticket/9473" target="_top">#9473</a>.
 176           </li>
 177 </ul></div>
 178 <h5>
 179 <a name="boost_regex.background.history.h7"></a>
 180         <span class="phrase"><a name="boost_regex.background.history.boost_1_54"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_54">Boost-1.54</a>
 181       </h5>
 182 <p>
 183         Fixed issue <a href="https://svn.boost.org/trac/boost/ticket/8569" target="_top">#8569</a>.
 184       </p>
 185 <h5>
 186 <a name="boost_regex.background.history.h8"></a>
 187         <span class="phrase"><a name="boost_regex.background.history.boost_1_53"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_53">Boost-1.53</a>
 188       </h5>
 189 <p>
 190         Fixed Issues: <a href="https://svn.boost.org/trac/boost/ticket/7744" target="_top">#7744</a>,
 191         <a href="https://svn.boost.org/trac/boost/ticket/7644" target="_top">#7644</a>.
 192       </p>
 193 <h5>
 194 <a name="boost_regex.background.history.h9"></a>
 195         <span class="phrase"><a name="boost_regex.background.history.boost_1_51"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_51">Boost-1.51</a>
 196       </h5>
 197 <p>
 198         Fixed issues: <a href="https://svn.boost.org/trac/boost/ticket/589" target="_top">#589</a>,
 199         <a href="https://svn.boost.org/trac/boost/ticket/7084" target="_top">#7084</a>,
 200         <a href="https://svn.boost.org/trac/boost/ticket/7032" target="_top">#7032</a>,
 201         <a href="https://svn.boost.org/trac/boost/ticket/6346" target="_top">#6346</a>.
 202       </p>
 203 <h5>
 204 <a name="boost_regex.background.history.h10"></a>
 205         <span class="phrase"><a name="boost_regex.background.history.boost_1_50"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_50">Boost-1.50</a>
 206       </h5>
 207 <p>
 208         Fixed issue with <code class="computeroutput"><span class="special">(?!)</span></code> not being
 209         a valid expression, and updated docs on what constitutes a valid conditional
 210         expression.
 211       </p>
 212 <h5>
 213 <a name="boost_regex.background.history.h11"></a>
 214         <span class="phrase"><a name="boost_regex.background.history.boost_1_48"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_48">Boost-1.48</a>
 215       </h5>
 216 <p>
 217         Fixed issues: <a href="https://svn.boost.org/trac/boost/ticket/688" target="_top">#698</a>,
 218         <a href="https://svn.boost.org/trac/boost/ticket/5835" target="_top">#5835</a>,
 219         <a href="https://svn.boost.org/trac/boost/ticket/5958" target="_top">#5958</a>,
 220         <a href="https://svn.boost.org/trac/boost/ticket/5736" target="_top">#5736</a>.
 221       </p>
 222 <h5>
 223 <a name="boost_regex.background.history.h12"></a>
 224         <span class="phrase"><a name="boost_regex.background.history.boost_1_47"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_47">Boost
 225         1.47</a>
 226       </h5>
 227 <p>
 228         Fixed issues: <a href="https://svn.boost.org/trac/boost/ticket/5223" target="_top">#5223</a>,
 229         <a href="https://svn.boost.org/trac/boost/ticket/5353" target="_top">#5353</a>,
 230         <a href="https://svn.boost.org/trac/boost/ticket/5363" target="_top">#5363</a>,
 231         <a href="https://svn.boost.org/trac/boost/ticket/5462" target="_top">#5462</a>,
 232         <a href="https://svn.boost.org/trac/boost/ticket/5472" target="_top">#5472</a>,
 233         <a href="https://svn.boost.org/trac/boost/ticket/5504" target="_top">#5504</a>.
 234       </p>
 235 <h5>
 236 <a name="boost_regex.background.history.h13"></a>
 237         <span class="phrase"><a name="boost_regex.background.history.boost_1_44"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_44">Boost
 238         1.44</a>
 239       </h5>
 240 <p>
 241         Fixed issues: <a href="https://svn.boost.org/trac/boost/ticket/4309" target="_top">#4309</a>,
 242         <a href="https://svn.boost.org/trac/boost/ticket/4215" target="_top">#4215</a>,
 243         <a href="https://svn.boost.org/trac/boost/ticket/4212" target="_top">#4212</a>,
 244         <a href="https://svn.boost.org/trac/boost/ticket/4191" target="_top">#4191</a>,
 245         <a href="https://svn.boost.org/trac/boost/ticket/4132" target="_top">#4132</a>,
 246         <a href="https://svn.boost.org/trac/boost/ticket/4123" target="_top">#4123</a>,
 247         <a href="https://svn.boost.org/trac/boost/ticket/4114" target="_top">#4114</a>,
 248         <a href="https://svn.boost.org/trac/boost/ticket/4036" target="_top">#4036</a>,
 249         <a href="https://svn.boost.org/trac/boost/ticket/4020" target="_top">#4020</a>,
 250         <a href="https://svn.boost.org/trac/boost/ticket/3941" target="_top">#3941</a>,
 251         <a href="https://svn.boost.org/trac/boost/ticket/3902" target="_top">#3902</a>,
 252         <a href="https://svn.boost.org/trac/boost/ticket/3890" target="_top">#3890</a>
 253       </p>
 254 <h5>
 255 <a name="boost_regex.background.history.h14"></a>
 256         <span class="phrase"><a name="boost_regex.background.history.boost_1_42"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_42">Boost
 257         1.42</a>
 258       </h5>
 259 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 260 <li class="listitem">
 261             Added support for Functors rather than strings as format expressions.
 262           </li>
 263 <li class="listitem">
 264             Improved error reporting when throwing exceptions to include better more
 265             relevant information.
 266           </li>
 267 <li class="listitem">
 268             Improved performance and reduced stack usage of recursive expressions.
 269           </li>
 270 <li class="listitem">
 271             Fixed tickets <a href="https://svn.boost.org/trac/boost/ticket/2802" target="_top">#2802</a>,
 272             <a href="https://svn.boost.org/trac/boost/ticket/3425" target="_top">#3425</a>,
 273             <a href="https://svn.boost.org/trac/boost/ticket/3507" target="_top">#3507</a>,
 274             <a href="https://svn.boost.org/trac/boost/ticket/3546" target="_top">#3546</a>,
 275             <a href="https://svn.boost.org/trac/boost/ticket/3631" target="_top">#3631</a>,
 276             <a href="https://svn.boost.org/trac/boost/ticket/3632" target="_top">#3632</a>,
 277             <a href="https://svn.boost.org/trac/boost/ticket/3715" target="_top">#3715</a>,
 278             <a href="https://svn.boost.org/trac/boost/ticket/3718" target="_top">#3718</a>,
 279             <a href="https://svn.boost.org/trac/boost/ticket/3763" target="_top">#3763</a>,
 280             <a href="https://svn.boost.org/trac/boost/ticket/3764" target="_top">#3764</a>
 281           </li>
 282 </ul></div>
 283 <h5>
 284 <a name="boost_regex.background.history.h15"></a>
 285         <span class="phrase"><a name="boost_regex.background.history.boost_1_40"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_40">Boost
 286         1.40</a>
 287       </h5>
 288 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 289             Added support for many Perl 5.10 syntax elements including named sub-expressions,
 290             branch resets and recursive regular expressions.
 291           </li></ul></div>
 292 <h5>
 293 <a name="boost_regex.background.history.h16"></a>
 294         <span class="phrase"><a name="boost_regex.background.history.boost_1_38"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_38">Boost
 295         1.38</a>
 296       </h5>
 297 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 298 <li class="listitem">
 299             <span class="bold"><strong>Breaking change</strong></span>: empty expressions,
 300             and empty alternatives are now allowed when using the Perl regular expression
 301             syntax. This change has been added for Perl compatibility, when the new
 302             <a class="link" href="../ref/syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a>
 303             <span class="emphasis"><em>no_empty_expressions</em></span> is set then the old behaviour
 304             is preserved and empty expressions are prohibited. This is issue <a href="https://svn.boost.org/trac/boost/ticket/1081" target="_top">#1081</a>.
 305           </li>
 306 <li class="listitem">
 307             Added support for Perl style ${n} expressions in format strings (issue
 308             <a href="https://svn.boost.org/trac/boost/ticket/2556" target="_top">#2556</a>).
 309           </li>
 310 <li class="listitem">
 311             Added support for accessing the location of sub-expressions within the
 312             regular expression string (issue <a href="https://svn.boost.org/trac/boost/ticket/2269" target="_top">#2269</a>).
 313           </li>
 314 <li class="listitem">
 315             Fixed compiler compatibility issues <a href="https://svn.boost.org/trac/boost/ticket/2244" target="_top">#2244</a>,
 316             <a href="https://svn.boost.org/trac/boost/ticket/2514" target="_top">#2514</a>,
 317             and <a href="https://svn.boost.org/trac/boost/ticket/2244" target="_top">#2458</a>.
 318           </li>
 319 </ul></div>
 320 <h5>
 321 <a name="boost_regex.background.history.h17"></a>
 322         <span class="phrase"><a name="boost_regex.background.history.boost_1_34"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_34">Boost
 323         1.34</a>
 324       </h5>
 325 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 326 <li class="listitem">
 327             Fix for non-greedy repeats and partial matches not working correctly
 328             in some cases.
 329           </li>
 330 <li class="listitem">
 331             Fix for non-greedy repeats on VC++ not working in some cases (bug report
 332             1515830).
 333           </li>
 334 <li class="listitem">
 335             Changed match_results::position() to return a valid result when *this
 336             represents a partial match.
 337           </li>
 338 <li class="listitem">
 339             Fixed the grep and egrep options so that the newline character gets treated
 340             the same as |.
 341           </li>
 342 </ul></div>
 343 <h5>
 344 <a name="boost_regex.background.history.h18"></a>
 345         <span class="phrase"><a name="boost_regex.background.history.boost_1_33_1"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_33_1">Boost
 346         1.33.1</a>
 347       </h5>
 348 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 349 <li class="listitem">
 350             Fixed broken makefiles.
 351           </li>
 352 <li class="listitem">
 353             Fixed configuration setup to allow building with VC7.1 - STLport-4.6.2
 354             when using /Zc:wchar_t.
 355           </li>
 356 <li class="listitem">
 357             Moved declarations class-inline in static_mutex.hpp so that SGI Irix
 358             compiler can cope.
 359           </li>
 360 <li class="listitem">
 361             Added needed standard library #includes to fileiter.hpp, regex_workaround.hpp
 362             and cpp_regex_traits.hpp.
 363           </li>
 364 <li class="listitem">
 365             Fixed a bug where non-greedy repeats could in certain strange circumstances
 366             repeat more times than their maximum value.
 367           </li>
 368 <li class="listitem">
 369             Fixed the value returned by basic_regex&lt;&gt;::empty() from a default
 370             constructed object.
 371           </li>
 372 <li class="listitem">
 373             Changed the definition of regex_error to make it backwards compatible
 374             with Boost-1.32.0.
 375           </li>
 376 <li class="listitem">
 377             Disabled external templates for Intel C++ 8.0 and earlier - otherwise
 378             unresolved references can occur.
 379           </li>
 380 <li class="listitem">
 381             Rewritten extern template code for gcc so that only specific member functions
 382             are exported: otherwise strange unresolved references can occur when
 383             linking and mixing debug and non-debug code.
 384           </li>
 385 <li class="listitem">
 386             Initialise all the data members of the unicode_iterators: this keeps
 387             gcc from issuing needless warnings.
 388           </li>
 389 <li class="listitem">
 390             Ported the ICU integration code to VC6 and VC7.
 391           </li>
 392 <li class="listitem">
 393             Ensured code is STLport debug mode clean.
 394           </li>
 395 <li class="listitem">
 396             Fixed lookbehind assertions so that fixed length repeats are permitted,
 397             and so that regex iteration allows lookbehind to look back before the
 398             current search range (into the last match).
 399           </li>
 400 <li class="listitem">
 401             Fixed strange bug with non-greedy repeats inside forward lookahead assertions.
 402           </li>
 403 <li class="listitem">
 404             Enabled negated character classes inside character sets.
 405           </li>
 406 <li class="listitem">
 407             Fixed regression so that [a-z-] is a valid expression again.
 408           </li>
 409 <li class="listitem">
 410             Fixed bug that allowed some invalid expressions to be accepted.
 411           </li>
 412 </ul></div>
 413 <h5>
 414 <a name="boost_regex.background.history.h19"></a>
 415         <span class="phrase"><a name="boost_regex.background.history.boost_1_33_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_33_0">Boost
 416         1.33.0</a>
 417       </h5>
 418 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 419 <li class="listitem">
 420             Completely rewritten expression parsing code, and traits class support;
 421             now conforms to the standardization proposal.
 422           </li>
 423 <li class="listitem">
 424             Breaking Change: The syntax options that can be passed to basic_regex
 425             constructors have been rationalized. The default option (perl) now has
 426             a value of zero, and it is now clearly documented which options apply
 427             to which regular expression syntax styles (perl, POSIX-extended, POSIX-basic
 428             etc). Some of the more esoteric options have now been removed, so there
 429             is the possibility that existing code may fail to compile: however equivalent
 430             functionality should still be available.
 431           </li>
 432 <li class="listitem">
 433             Breaking Change: POSIX-extended and POSIX-basic regular expressions now
 434             enforce the letter of the POSIX standard much more closely than before.
 435           </li>
 436 <li class="listitem">
 437             Added support for (?imsx-imsx) constructs.
 438           </li>
 439 <li class="listitem">
 440             Added support for lookbehind expressions (?&lt;=positive-lookbehind)
 441             and (?&lt;!negative-lookbehind).
 442           </li>
 443 <li class="listitem">
 444             Added support for conditional expressions (?(assertion)true-expression|false-expression).
 445           </li>
 446 <li class="listitem">
 447             Added MFC/ATL string wrappers.
 448           </li>
 449 <li class="listitem">
 450             Added Unicode support; based on ICU.
 451           </li>
 452 <li class="listitem">
 453             Changed newline support to recognise \f as a line separator (all character
 454             types), and \x85 as a line separator for wide characters / Unicode only.
 455           </li>
 456 <li class="listitem">
 457             Added a new format flag format_literal that treats the replace string
 458             as a literal, rather than a Perl or Sed style format string.
 459           </li>
 460 <li class="listitem">
 461             Errors are now reported by throwing exceptions of type regex_error. The
 462             types used previously - bad_expression and bad_pattern - are now just
 463             typedefs for regex_error. Type regex_error has a couple of new members:
 464             code() to report an error code rather than a string, and position() to
 465             report where in the expression the error occurred.
 466           </li>
 467 </ul></div>
 468 <h5>
 469 <a name="boost_regex.background.history.h20"></a>
 470         <span class="phrase"><a name="boost_regex.background.history.boost_1_32_1"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_32_1">Boost
 471         1.32.1</a>
 472       </h5>
 473 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 474             Fixed bug in partial matches of bounded repeats of '.'.
 475           </li></ul></div>
 476 <h5>
 477 <a name="boost_regex.background.history.h21"></a>
 478         <span class="phrase"><a name="boost_regex.background.history.boost_1_31_0"></a></span><a class="link" href="history.html#boost_regex.background.history.boost_1_31_0">Boost
 479         1.31.0</a>
 480       </h5>
 481 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 482 <li class="listitem">
 483             Completely rewritten pattern matching code - it is now up to 10 times
 484             faster than before.
 485           </li>
 486 <li class="listitem">
 487             Reorganized documentation.
 488           </li>
 489 <li class="listitem">
 490             Deprecated all interfaces that are not part of the regular expression
 491             standardization proposal.
 492           </li>
 493 <li class="listitem">
 494             Added regex_iterator and regex_token_iterator .
 495           </li>
 496 <li class="listitem">
 497             Added support for Perl style independent sub-expressions.
 498           </li>
 499 <li class="listitem">
 500             Added non-member operators to the sub_match class, so that you can compare
 501             sub_match's with strings, or add them to a string to produce a new string.
 502           </li>
 503 <li class="listitem">
 504             Added experimental support for extended capture information.
 505           </li>
 506 <li class="listitem">
 507             Changed the match flags so that they are a distinct type (not an integer),
 508             if you try to pass the match flags as an integer rather than match_flag_type
 509             to the regex algorithms then you will now get a compiler error.
 510           </li>
 511 </ul></div>
 512 </div>
 513 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 514 <td align="left"></td>
 515 <td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<p>
 516         Distributed under the Boost Software License, Version 1.0. (See accompanying
 517         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>)
 518       </p>
 519 </div></td>
 520 </tr></table>
 521 <hr>
 522 <div class="spirit-nav">
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