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