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Alternative Algorithms for Bit-Parallel String Matching

  • Hannu Peltola
  • Jorma Tarhio
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2857)

Abstract

We consider bit-parallel algorithms of Boyer-Moore type for exact string matching. We introduce a two-way modification of the BNDM algorithm. If the text character aligned with the end of the pattern is a mismatch, we continue by examining text characters after the alignment. Besides this two-way variation, we present a simplified version of BNDM without prefix search and an algorithm scheme for long patterns. We also study a different bit-parallel algorithm, which keeps the history of examined characters in a bit-vector and where shifting is based on this bit-vector. We report experiments where we compared the new algorithms with existing ones. The simplified BNDM is the most promising of the new algorithms in practice.

Keywords

String Match English Text Alternative Algorithm Text Character Zero Padding 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Hannu Peltola
    • 1
  • Jorma Tarhio
    • 1
  1. 1.Department of Computer Science and EngineeringHelsinki University of TechnologyFinland

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