title: How do I get Vim to treat underscores in a string as a word break?
body: <p>I would like Vim to treat underscores in a string as word-breaks, just like a spaces.  For example, if I have:</p>
  
  <pre><code>sub foo_bar {
      return;
  }
  </code></pre>
  
  <p>With the cursor starting at the far left of the first line, (on the 's' of 'sub'), hitting 'w' will place the cursor on the 'f' in 'foo', a second press of 'w' takes me to the curly, and a third hops down to the 'r' of 'return'.  I want that second press of 'w' to take me to the 'b' in 'bar'.</p>