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FPL
2008
Springer

High-speed regular expression matching engine using multi-character NFA

10 years 1 months ago
High-speed regular expression matching engine using multi-character NFA
An approach is presented for high throughput matching of regular expressions (regexes) by first converting them into corresponding Non-deterministic Finite Automata (NFAs) which are then configured onto a FPGA. The key novel feature is a technique that, for any given regex, constructs an NFA that processes multiple characters per clock cycle. An efficient algorithm is proposed that outputs an NFA which processes twice the number of characters as the input one. A technique is also proposed that implements the range match operation (e.g. [a-z]) efficiently. A program has been written that implements above ideas to convert regexes into NFAs specified in a structural Hardware Design Language (HDL), which are then mapped onto a FPGA. Performance is evaluated using real world regexes (Snort ruleset). The results demonstrate the practical utility of the approach. For example, for a set of 2,691 regexes, while the standard 1
Norio Yamagaki, Reetinder P. S. Sidhu, Satoshi Kam
Added 26 Oct 2010
Updated 26 Oct 2010
Type Conference
Year 2008
Where FPL
Authors Norio Yamagaki, Reetinder P. S. Sidhu, Satoshi Kamiya
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