title: Jquery, Given a string and its coordinates replace it
body: <p>I have a string like that:</p>
  
  <blockquote>
    <p>I'm a string not too long but neither so short</p>
  </blockquote>
  
  <p>Let's take the word 'not' inside the string: it starts at position number 13 and it ends at position numer 16.</p>
  
  <p>There's a way with JQuery to substitute the word between position 13 and position 16 with this:</p>
  
  <pre><code>&lt;b&gt;not&lt;/b&gt;
  </code></pre>
  
  <p>I know only the position of the string that i want to replace not it's content.</p>