This google script code scrubs a website, gets a particular text value and inserts new row in a google spreadsheet with the date and value. I use this with a daily time-driven trigger to update the spreadsheet and show an interactive graph.

UpdateDailyValuesFromWeb.gs

function UpdateDailyGoldValues() 
{  
  //Initialize website url and get content
  var dinamalarWS = UrlFetchApp.fetch("http://business.dinamalar.com/gold_silver_rate.asp");
  var strs = dinamalarWS.getContentText();
  
  //get string
  var index1 = strs.search("<div id=\"selGoldk\"> <span id=\"selGoldkt\"> 22 காரட் 1கி்  </span><br>");
  var index2 = strs.search("<div style=\"border:none;\" id=\"selGoldk\"> <span id=\"selGoldkt\"> 24 காரட் 10கி் </span> <br>");  
  var substrs = strs.slice(index1, index2);  
  var index3 = substrs.search("width:11px;\">");
  var index4 = substrs.search("<img style=\"margin:0px 5px;");
  var subsubstrs = substrs.slice(index3+13, index4);
  
  //Initialize spreadsheet
  var sh = SpreadsheetApp.getActiveSpreadsheet().getSheets()[0];

  //Insert values to spreadsheet
  var numrows = sh.getDataRange().getNumRows();
  sh.getRange(numrows + 1, 1).setValue(new Date());
  sh.getRange(numrows + 1, 2).setValue(subsubstrs);
}