title: Stop Google indexing subdomains
body: <p>I have a site that uses wildcard subdomains so that when somebody signs up they get there own subdomain.</p>
  
  <p>I do no want google (or other serach engines) to crawl and index any of the subdomains (accept for www.)</p>
  
  <p>Is there away to do this with robots.txt?</p>
  
  <p>Regards</p>