title: Regex for milliseconds
body: <p>I want to find date time patterns in a file like this</p>
  
  <blockquote>
    <p><code>Blah blah blah 2015-08-28 08:40:34,100 blah blah blah 2015-08-28 08:40:34,124  blah blah blah ....</code></p>
  </blockquote>
  
  <p>I am using this pattern</p>
  
  <pre><code> string pattern =
   @"(?&lt;logDate&gt;(\d){4}-(\d){2}-(\d){2}\s(\d){2}:(\d){2}:(\d){2})";
  </code></pre>
  
  <p>Can anybody suggest how to add <code>milliseconds</code> part to this <code>regex</code>?</p>