ing to look at the matched string again.
            The <span class="emphasis"><em>Spirit.Lex</em></span> library is not different with respect
            to this, as it uses the token ids as the main means of identification
            of the different token types defined for a particular lexical analyzer.
            However, it is different from commonly used lexical analyzers in the
            sense that it returns (references to) instances of a (user defined) token
            class to the user. The