Snapping a three-day losing streak, the BSE benchmark Sensex recovered by nearly 22 points in early trade today on selective buying by funds amid a firming trend in Asian regions.The 30-share barometer, which had lost over 44 points in the previous three sessions, recovered by 21.84 points, or 0.12 per cent, to 17,579.58 in first five minutes of trading.Similarly, the wide-based National Stock Exchange index Nifty inched up by 5.05 points, or 0.09 per cent, to 5,325.45.Refinery, consumer durable and realty sectors stock led the gains. Brokers said selective buying by funds, driven by a firm trend on Asian bourses mainly boosted the trading sentiment.