The Sensex today regained the 18,000-points level after almost 25 months on aggressive buying by funds expecting good fourth quarter results by corporates. The Sensex, which was on an upward march in the last three trading sessions, moved up further by 67 points to 18,008 in opening trade, the highest since February 2008. Similarly, the National Stock Exchange index Nifty rose by 20 points to 5,386 points. Stock brokers said firming Asian markets also supported the uptrend on the domestic front.