Computer Science ›› 2015, Vol. 42 ›› Issue (4): 244-248.doi: 10.11896/j.issn.1002-137X.2015.04.050

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Dynamic Pruning Algorithm for Pattern Matching with Wildcards and Length Constraints

WANG Hai-ping, DAI Wei and GUO Dan   

  • Online:2018-11-14 Published:2018-11-14

Abstract: Recently,with the development of bioinformatics,network security and information retrieval,wildcards are playing an increasingly key role in pattern ma-tching problems.Among these,the challenging problem of pattern ma-tching with wildcards and length constraints (PMWL) further extends the flexibility of pattern matching,thus bringing convenience to the user but producing the expense of higher computational complexity.Therefore,how to get a better matching solution in polynomial time has been well studied and developed.Based on the previous work,we presented a heuristic Pawn algorithm for PMWL.After transforming the PMWL problem into path search problem,a dynamic strategy is adopted with a pruning procedure in an alternating iterative manner.Experiments demonstrate that,comparing with the state-of-the-art algorithm,Pawn algorithm can improve the number of matching occurrences in most cases of 196 artificial patterns with certain characteristic and the DNA sequences.

Key words: Pattern matching,Wildcard,Pruning,Constraints

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