title: vim: how to replace text in visual mode selection?
body: <p>I've got a text file:</p>
  
  <pre><code>hello world ssh! 
  this is your destiny 
  Oh my goodness 
  </code></pre>
  
  <p>In visual mode, I select from "world" to "my": I wish to change letter 's' into 'k' in my selection.</p>
  
  <p>I definition cannot use line-mode because in that way the 3rd line's "goodness" will be changed.</p>
  
  <p>So how to do this replacement in visual mode?</p>