title: Match string with Exactly 2 of a given character? (e.g. 2 literal periods)
body: <p>Can someone help me with a regex to match on any string that has exactly 2 periods?</p>
  
  <p>This <strong>should</strong> match: 12.3.2 Fusion<br />
  This <strong>should not</strong> match: 12.3.2.1 Fusion.</p>
  
  <p>I know this is failrly easy i'm sure.  Just not too familiar with regex yet.</p>
  
  <p>Thanks!</p>