c user: <em>KEYWORD +owner.raw:"USER"</em></li>
          <li>Search by time range: <em>KEYWORD AND commit_time:["2013-07-08" TO "2013-09-10"]</em></li>
          <li>Avaliable fields: <em>name, project, owner, committer, commit_time, language, ...</em></li>
          <li>Syntax: <a href="http://lucene.apache.org/core/2_9_4/queryparsersyntax.html">Syntax of Lucence query</a></li>
          <li><a href="http://code.dapps.douban.com/gist/liwentao/678/">Code search document</a></li>
          <li><a href="http