   <p>A pattern that matches any whitespace character (&lsquo;\t&rsquo;, &lsquo;\v&rsquo;, &lsquo;\f&rsquo;, &lsquo;\n&rsquo;,
      &lsquo;\r&rsquo;, space).</p>

    <p><a id="lexer.style_at"></a></p>

    <h3><code>lexer.style_at</code> (table, Read-only)</h3>

    <p>Table of style names at positions in the buffer starting from 1.</p>

    <p><a id="lexer.upper"></a></p>

    <h3><code>lexer.upper</code> (pattern)</h3>

    <p>A pattern that matches any upper case character (&lsquo;A&rsquo;-&lsquo;Z&rsq