|
 ABSTRACT
This paper describes a simple, efficient algorithm to locate all occurrences of any of a finite number of keywords in a string of text. The algorithm consists of constructing a finite state pattern matching machine from the keywords and then using the pattern matching machine to process the text string in a single pass. Construction of the pattern matching machine takes time proportional to the sum of the lengths of the keywords. The number of state transitions made by the pattern matching machine in processing the text string is independent of the number of keywords. The algorithm has been used to improve the speed of a library bibliographic search program by a factor of 5 to 10.
REFERENCES
Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.
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INDEX TERMS
Primary Classification:
F.
Theory of Computation
F.2
ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY
F.2.2
Nonnumerical Algorithms and Problems
Subjects:
Pattern matching
Additional Classification:
H.
Information Systems
H.3
INFORMATION STORAGE AND RETRIEVAL
H.3.3
Information Search and Retrieval
Subjects:
Retrieval models;
Search process
General Terms:
Algorithms,
Design,
Management,
Performance,
Theory
Keywords:
bibliographic search,
computational complexity,
finite state machines,
information retrieval,
keywords and phrases,
string pattern matching,
text-editing
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