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Document new build changes + standalone mode.

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@ -43,15 +43,39 @@
The library will encase all code inside namespace boost.
</p>
<p>
Unlike some other template libraries, this library consists of a mixture of
template code (in the headers) and static code and data (in cpp files). Consequently
it is necessary to build the library's support code into a library or archive
file before you can use it, instructions for specific platforms are as follows:
This is a header only library provided your compiler supports C++11 or later.
Support for C++03 compilers is still present, but is now deprecated and may
be removed without further notice!
</p>
<p>
The only people that still need to build the external libboost_regex library
are those that are either:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Using the library in C++03 mode, or,
</li>
<li class="listitem">
Using the deprecated POSIX C API's
</li>
</ul></div>
<p>
Further, this library may now be used in "standalone" mode without
the rest of the Boost C++ libraries, in order to do this you must either:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Have a C++17 compiler that supports <code class="computeroutput"><span class="identifier">__has_include</span></code>,
in this case if <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">config</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code> is not present then the library will
automoatically enter standalone mode. Or:
</li>
<li class="listitem">
Define BOOST_REGEX_STANDALONE when building.
</li>
</ul></div>
<h5>
<a name="boost_regex.install.h0"></a>
<span class="phrase"><a name="boost_regex.install.building_with_bjam"></a></span><a class="link" href="install.html#boost_regex.install.building_with_bjam">Building
with bjam</a>
<span class="phrase"><a name="boost_regex.install.c_03_users_only_deprecated_build"></a></span><a class="link" href="install.html#boost_regex.install.c_03_users_only_deprecated_build"><span class="bold"><strong>C++03 users only (Deprecated)</strong></span> Building with bjam</a>
</h5>
<p>
This is now the preferred method for building and installing this library,