title: custom parser for digits and characters
body: <p>Hi I would like to write a parser like the one below except I would like it to take characters with the the digits like <code>345j</code>, <code>982p0</code>. What would I change to be able to have characters with numbers?</p>
  
  <pre><code>ts.addParser({
      id: "digit",
      is: function (s, table) {
          var c = table.config;
          return $.tablesorter.isDigit(s, c);
      },
      format: function (s) {
          return $.tablesorter.formatFloat(s);
      },
      type: "numeric"
  });
  </code></pre>