Update history and regenerate docs.

doc/history.qbk

@@ -18,6 +18,7 @@ All issues including closed ones can be viewed [@https://github.com/boostorg/reg
 
 * [*Breaking Change:] Change \B to be the opposite of \b as per Perl behaviour.
 * Change w32_regex_traits.hpp so that windows.h is no longer included. 
+* Fxed fuzzing related issues [@https://github.com/boostorg/regex/issues/156 #151], [@https://github.com/boostorg/regex/issues/156 #152], [@https://github.com/boostorg/regex/issues/156 #153], [@https://github.com/boostorg/regex/issues/156 #156].
 
 [h4 Boost.Regex-6.0.0 (Boost-1.77.0)]
 

doc/html/boost_regex/background/history.html

@@ -47,6 +47,12 @@
 <li class="listitem">
             Change w32_regex_traits.hpp so that windows.h is no longer included.
           </li>
+<li class="listitem">
+            Fxed fuzzing related issues <a href="https://github.com/boostorg/regex/issues/156" target="_top">#151</a>,
+            <a href="https://github.com/boostorg/regex/issues/156" target="_top">#152</a>,
+            <a href="https://github.com/boostorg/regex/issues/156" target="_top">#153</a>,
+            <a href="https://github.com/boostorg/regex/issues/156" target="_top">#156</a>.
+          </li>
 </ul></div>
 <h5>
 <a name="boost_regex.background.history.h1"></a>

doc/html/boost_regex/install.html

@@ -106,7 +106,8 @@
     </p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
           BOOST_REGEX_STANDALONE when set then no other Boost libraries are targeted
-          as dependencies, and Boost.Regex is placed in standalone mode.
+          as dependencies, and Boost.Regex is placed in standalone mode. Invoke CMake
+          with -DBOOST_REGEX_STANDALONE=on to enable standalone mode.
         </li></ul></div>
 <h5>
 <a name="boost_regex.install.h1"></a>

doc/html/boost_regex/syntax/perl_syntax.html

@@ -364,9 +364,14 @@
 </tr>
 </tbody>
 </table></div>
+<p>
+        Note that a back reference can also be a forward-reference to a sub-expression
+        that has not yet been seen - this only really makes sense within a repeat,
+        so for example <code class="computeroutput"><span class="special">(\</span><span class="number">2</span><span class="identifier">two</span><span class="special">|(</span><span class="identifier">one</span><span class="special">))+</span></code> will match "oneonetwo".
+      </p>
 <p>
         Finally the \k escape can be used to refer to named subexpressions, for example
-        <code class="literal">\k&lt;two&gt;</code> will match whatever matched the subexpression
+        <code class="literal">\k&lt;two&gt;</code> will whatever matched the subexpression
         named "two".
       </p>
 <h5>

doc/html/index.html

@@ -215,7 +215,7 @@
   </p>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: October 10, 2021 at 15:39:14 GMT</small></p></td>
+<td align="left"><p><small>Last revised: November 05, 2021 at 17:17:10 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>