Google App script extracting data from website

So I am writing a script which look at review done on google+ pages and updates a google spreadsheet.

I have found out that the line in the html which holds this value is

<span class="A7a">103</span>

I just need to make it possible for me to extract from the page with just knowing the URL and that html code.

Solution

Use

var response = UrlFetchApp.fetch("http://www.website.com/");

To fetch the html of the page. Then use something like

var cut = response.substring( str.indexOf( "<span class="A7a">" ), response.length);
var value = cut.substring(0, cut.indexOf("</span>"));