var list =project.Lists["listName"]; // change listName to the name of your list with results
var pattern = @"\d+"; // regex here
var input = instance.ActiveTab.PageText;
var regex = new System.Text.RegularExpressions.Regex(pattern);
var matches = regex.Matches(input);
for(int i =0;i<matches.Count;i++)
{
list.Add(matches[i].Value);
}