Push every new match from regEx in array

Alternate Solution: Since you are trying to access xml data you can use XMLservice.parser

However there seems to a problem in the fetch call, I was unable to get the whole data (fetch gives a truncated file, perhaps it is timing out, 16mb file) , so I downloaded the data file and uploaded it into google drive. This file could be used to parse XML data like so:

function parseXml() {

      var file = DriveApp.getFileById("Xml File ID")   //Get the id of the uploaded file and replace it for "Xml File ID"
      var xml = file.getBlob().getDataAsString()
      // The below code gave a error for XML parser
     /*var url = 'http://www.inpo.ru/documents/pricelists/pricelist.xml';
       var options = {
       'method' : 'get',
       'contentType': 'application/xml',
       }
      var xml = UrlFetchApp.fetch(url,options).getBlob().getDataAsString()
      Logger.log(xml)*/
     // End of code with gave an error

 var arrayItems = []
 var XmlElem = ["no","title","price","unit","free"]       //Elements to look for
 var document = XmlService.parse(xml);
 var RCounter = 0
 var groups = document.getRootElement().getChildren();   //GetGroup Element
    for(var k = 0; k< groups.length; k++){               // Loop through each group element
      var main = groups[k].getChildren()                // Get sub groups in each group
  for (var j=0 ; j < main.length; j++){                 // Loop through each subGroups

   var mainChilds = main[j].getChildren()               //Get items in each subGroups
   for (var l = 0 ; l < mainChilds.length; l++){        // Loop through each items
   var items = mainChilds[l].getChildren();             // Get  elemetns like "no","title","price","units","free" in each item 
     arrayItems[RCounter] = []
   var total = 0;
    for (var i = 0; i < items.length; i++) {
     // Logger.log(items[i].getName())
      var index = XmlElem.indexOf(items[i].getName())       //Look for items and place the value at corresponding index
      if(index != -1)
        arrayItems[RCounter][index] = items[i].getValue()
     }  //End Loope for elements
     if(arrayItems[RCounter].length > 0)                   //in case the array is empty, reuse it
      RCounter++
    }   // End loop for items
    }   // End loop for sub Groups
    }   // End loop for Groups
  Logger.log(arrayItems) 
}

Hope that helps!