title: Crawl and extract websites to certain format
body: <p>I need a crawler to fetch webpages and extract certain data from them .
  I've done this thing in php but it's pretty buggy I was asking if there's an open source platform or anything that can do it .</p>
  
  <p><strong>Explain ?</strong></p>
  
  <p>the fetched page content </p>
  
  <pre><code>iPhone 5S is a great phone with 1.2 Ghz dual core processor .
  </code></pre>
  
  <p>The crawler should return </p>
  
  <pre><code>iPhone &gt; product name (given in a database )
  
  1.2 Ghz &gt; processor (the code should be able to identify the ghz or MHz to understand that this is a processor value )
  
  Dual core &gt; processor cores 
  </code></pre>
  
  <p>This is a simple example of what it should do , it should be able to identify things inside contexts and ignore unneeded strings and numbers .</p>
  
  <p>Is there is anything like that ?? </p>