title: Selecting a dynamic checkbox in selenium using regex
body: <p>I am trying to select a checkbox whose ids are generated dynamically but couldn't solve it.<br>
  Tried following </p>
  
  <pre><code>Selenium.check("id=regexp:ctl00_cphMain_cbx_[a-zA-Z0-9_,]*")
  Selenium.check("xpath=(//input[@type='checkbox'])[position()=1]")
  </code></pre>
  
  <p>Also this check box has only dynamic id, no name etc. any idea what I am doing wrong.</p>
  
  <p>Regards</p>