title: How to replace partial content with ruby regular expressions
body: <p>I have a string containing this</p>
  
  <pre><code>some_string = "[quote=\"user.name, post:1, topic:14\"] some other content here"
  </code></pre>
  
  <p>And i'm looking to replace the number of post and topic, something like this: </p>
  
  <pre><code>"[quote=\"user.name, post:#{a}, topic:#{b}\"] whatevercontent"
  </code></pre>
  
  <p>How can i achieve this?</p>