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- W2111194889 abstract "Regular expressions (RegExes) are widely used, yet their inherent complexity often limits the total number of RegExes that can be detected using a single chip for a reasonable throughput. This limit on the number of RegExes impairs the scalability of today's RegEx detection systems. The scalability of existing schemes is generally limited by the traditional detection paradigm based on per-character-state processing and state transition detection. The main focus of existing schemes is on optimizing the number of states and the required transitions, but not on optimizing the suboptimal character-based detection method. Furthermore, the potential benefits of allowing out-of-sequence detection, instead of detecting components of a RegEx in the order of appearance, have not been explored. Lastly, the existing schemes do not provide ways to adapt to the evolving RegExes. In this paper, we propose Lookahead Finite Automata (LaFA) to perform scalable RegEx detection. LaFA requires less memory due to these three contributions: 1) providing specialized and optimized detection modules to increase resource utilization; 2) systematically reordering the RegEx detection sequence to reduce the number of concurrent operations; 3) sharing states among automata for different RegExes to reduce resource requirements. Here, we demonstrate that LaFA requires an order of magnitude less memory compared to today's state-of-the-art RegEx detection systems. Using LaFA, a single-commodity field programmable gate array (FPGA) chip can accommodate up to 25n 000 (25 k) RegExes. Based on the throughput of our LaFA prototype on FPGA, we estimate that a 34-Gb/s throughput can be achieved." @default.
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- W2111194889 date "2012-06-01" @default.
- W2111194889 modified "2023-09-23" @default.
- W2111194889 title "Scalable Lookahead Regular Expression Detection System for Deep Packet Inspection" @default.
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- W2111194889 doi "https://doi.org/10.1109/tnet.2011.2181411" @default.
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