title: vim does not find and replace simple phrase that is clearly present
body: <p>I have a simple vim problem that Google hasn't managed to help me with.  Any thoughts are appreciated.</p>
  
  <p>I do the following search and replace:</p>
  
  <pre><code>:s/numnodes/numnodes1/g
  </code></pre>
  
  <p>On a file containing the following text:</p>
  
  <pre><code>numprocs=0  
  numnodes=0
  </code></pre>
  
  <p>I get </p>
  
  <pre><code>E486: Pattern not found
  </code></pre>
  
  <p>The position of the green square which indicates where I'd start typing is clearly above the pattern.  I tried searching for other short phrases not involving regex, which are also present, which also fail.  A simple /numnodes highlights matches as expected.  Does anyone have any idea what might be the matter with vim?</p>