title: How to determine if a string is a User SID?
body: <p>In Windows Operating System, user SIDs are represented with a string such as : </p>
  
  <blockquote>
    <p>S-5-1-76-1812374880-3438888550-261701130-6117</p>
  </blockquote>
  
  <p>Is there any way that I can identify that such a string is a valid User SID?</p>
  
  <p>Thanks.</p>