boost_v1_44_0_">What's
        changed in <span class="emphasis"><em>Spirit.Lex</em></span> from V2.3 (Boost V1.43.0) to V2.4
        (Boost V1.44.0)</a>
      </h5>
<h5>
<a name="spirit.what_s_new.spirit_2_4.h4"></a>
        <span class="phrase"><a name="spirit.what_s_new.spirit_2_4.new_lexer_features"></a></span><a class="link" href="spirit_2_4.html#spirit.what_s_new.spirit_2_4.new_lexer_features">New
        Lexer Features</a>
      </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-sty