Institutional Repository [SANDBOX]
Technical University of Crete
EN  |  EL

Search

Browse

My Space

RE-tree: an efficient index structure for regular expressions

Chan Chee-Yong, Garofalakis Minos, Rastogi Rajeev

Simple record


URIhttp://purl.tuc.gr/dl/dias/66495CCA-1AE1-48DA-AD5D-20DB8D5944C8-
Identifierhttp://link.springer.com/article/10.1007%2Fs00778-003-0094-0-
Identifierhttps://doi.org/10.1007/s00778-003-0094-0-
Languageen-
Extent18 pagesen
TitleRE-tree: an efficient index structure for regular expressionsen
CreatorChan Chee-Yongen
CreatorGarofalakis Minosen
CreatorΓαροφαλακης Μινωςel
CreatorRastogi Rajeeven
PublisherSpringer Verlagen
Content SummaryDue to their expressive power, regular expressions (REs) are quickly becoming an integral part of language specifications for several important application scenarios. Many of these applications have to manage huge databases of RE specifications and need to provide an effective matching mechanism that, given an input string, quickly identifies the REs in the database that match it. In this paper, we propose the RE-tree, a novel index structure for large databases of RE specifications. Given an input query string, the RE-tree speeds up the retrieval of matching REs by focusing the search and comparing the input string with only a small fraction of REs in the database. Even though the RE-tree is similar in spirit to other tree-based structures that have been proposed for indexing multidimensional data, RE indexing is significantly more challenging since REs typically represent infinite sets of strings with no well-defined notion of spatial locality. To address these new challenges, our RE-tree index structure relies on novel measures for comparing the relative sizes of infinite regular languages. We also propose innovative solutions for the various RE-tree operations including the effective splitting of RE-tree nodes and computing a "tight" bounding RE for a collection of REs. Finally, we demonstrate how sampling-based approximation algorithms can be used to significantly speed up the performance of RE-tree operations. Preliminary experimental results with moderately large synthetic data sets indicate that the RE-tree is effective in pruning the search space and easily outperforms naive sequential search approaches.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-29-
Date of Publication2003-
SubjectRegular expressionsen
SubjectIndex structureen
SubjectSize measuresen
SubjectSampling-based approximationsen
Bibliographic CitationC.-Y. Chan, M. Garofalakis and R. Rastogi, "RE-tree: an efficient index structure for regular expressions", VLDB J., vol. 12, no. 2, pp. 102-119, Ayg. 2003. doi:10.1007/s00778-003-0094-0en

Services

Statistics