 <a href="http://flex.sourceforge.net/" target="_top">Flex</a>
        or other lexical scanner generators (such as <a href="http://re2c.sourceforge.net/" target="_top">re2c</a>,
        <a href="http://www.cs.queensu.ca/~thurston/ragel/" target="_top">Ragel</a>, etc.).
        This dynamic flexibility allows you to speed up the development of your application.
      </p>
<h5>
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        <span class="phrase"><a name="spirit.lex.lexer_introduction.the_library_stru