title: NSString: strip out <b></b> and make an attributed string with color for that segment?
body: <p>Say if I have a string:</p>
  
  <blockquote>
    <p>This is a &lt; b >simple &lt; /b > string.</p>
  </blockquote>
  
  <p>I need to get rid of the &lt; b >, (sorry there is no space between b and angle bracket, for some reason the preview does not show it), also make the word 'simple' to be bold, my thought was:</p>
  
  <ol>
  <li>replace the angle brackets and br with empty space</li>
  <li>make the 'simple' segment to have attributes</li>
  </ol>
  
  <p>The problem is once the tags are removed, I still need to know the word's location, do I first  remember the location of 'simple', after removal, the location-4 should be the new location of 'simple'? Is there any better way? Or even transform html tag to attributes?</p>
  
  <p>Thanks</p>
  
  <p>edit:
  Should be b instead of br</p>