In this article we generalize the concepts of position automaton and ZPC structure to the regularK-expressions. We show that the ZPC structure can be built in linear time in the size of the expression and that the associated position automaton can be deduced from it in quadratic time. ...
Overlay automata approach to regular expression matching for intrusion detection and prevention systemEmbodiments are described for automata models for use in deep packet inspection. Various embodiments are described for a new automata model, Overlay DFA (ODFA), which captures state replication in DFAs....
Finite automata is virtually always used at some phase during regular expression matching and/or compilation regardless of implementation. This is in part due to the dual nature of regular expressions and finite automata. One can exactly describe the other and vice versa. This makes finite automata...
The main goal of theregexcrate is to serve as a general purpose regular expression engine. It aims to automatically balance low compile times, fast search times and low memory usage, while also providing a convenient API for users. In contrast, this crate provides a lower level regular express...
Automata From Regular Expressions Overview and Usage This is a python program to contructe-NFA,DFA, andminimised DFAfrom a givenregular expression, built as a class project for Formal Language and Automata Theory. It requires the python programming language: Python 2.7 (http://python.org/download...
Summary: We describe three regular expression-based methods to characterize as a regular language the language defined by a two-way automaton. The construction methods yield relatively simple techniques to directly construct one-way automata that simulate the behavior of two-way automata. The ...
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(1988) DNAid: A Macintosh full screen editor featuring a built-in regular expression interpreter for the search of specific patterns in biological sequence... F Dardel,P Bensoussan - 《Comput Appl Biosci》 被引量: 30发表: 1988年 Characterization of MexT, the regulator of the MexE-MexF-Opr...
More recently, default transitions have also been used extensively to significantly reduce sizes of deterministic automata for regular expression [8], [11]. The main idea is to effectively enable states with large overlapping identical sets of outgoing transitions to “share” outgoing transitions ...
RE to NFA:Given a regular expression, construct a nondeterministic-finite automaton. Myhill-Nerode Equivalence Classes:There are two subtypes: either, given a regular expression and two words, find out whether they are equivalent w.r.t. the language, or, given a regular expression and a word...