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As the network is growing fast and the viruses are spreading around the network more frequently, network intrusion prevention system (NIPS) is becoming more and more important. The traditional way for intrusion prevention is done by pure software solution with high performance CPU. However, this method is out of date, when gigabit network is booming and the high performance throughput is required. In recent years, the programmable hardware solutions have been proposed but they cannot deal with deep and large amount of pattern matching and are lack of flexibility when signatures are growing up. In this paper, we propose a novel pattern-matching coprocessor that overcomes the difficulties in TCAM implementation when pattern length is deep and signature set is large. Since patterns are all stored in TCAM, it is a scalable and flexible system.