title: Remove special characters from a string with a condition
body: <p>I have a string as below-</p>
  
  <pre class="lang-cs prettyprint-override"><code>"This is &lt;h2&gt;a place/h2&gt;
  &lt;p&gt;You know its a good place!&lt;/p&gt;
  &lt;ul&gt;
      &lt;li&gt;Booked your ticket #20130114074912_AN3P703C on Monday, January 14&lt;/li&gt;
  &lt;/ul&gt;"
  </code></pre>
  
  <p>So, I want my string to be as follows </p>
  
  <pre class="lang-none prettyprint-override"><code>"This is a place
  You know its a good place.
  Booked your ticket #20130114074912_AN3P703C on Monday, January 14"
  </code></pre>