for creatureName, xp in string.gfind(arg1, "(.+) dies, you gain (%d+) experience.") do 
    local restedXp = 0;
    for restedXp1 in string.gfind(arg1, "%(%+(%d+) exp Rested bonus") do 
    	restedXp = restedXp1
    end
    -- now creatureName, xp, restedXp has all I need
end