The BSE Sensex regained the 17,000 points level in early trade on Monday on continued buying by funds and retail investors ahead of RBI's mid-term credit policy review. The 30-share barometer which had climbed 272 points in the previous session, rose by over 153 points, to around 17,103, its highest level since May 4.The wide-based National Stock Exchange Nifty also traded marginally up by over 48 points, to around 5,187.