title: find and replace for setBackgroundImage with regular expression
body: <p>Here is my objective. 
  I want to search all <code>setBackgroundImage</code> call in my project and replace it with </p>
  
  <pre><code>[button setBackgroundColor:fixedColor];
  </code></pre>
  
  <p>problem is after setBackgroundImage: image name is different at different place. so i can not replace it in one go. </p>
  
  <p>Is there any regular expression available for the same which i can use for find and replace ? </p>