pattern search apparatus

48 Pages·2013·1.76 MB·English

US005963942A
United States Patent [19] [11] Patent Number: 5,963,942
Igata [45] Date of Patent: Oct. 5, 1999
[54] PATTERN SEARCH APPARATUS AND Alfred V. Aho et al., “Ef?cient String Matching: An Aid to
METHOD Bibliographic Search”, Communications of the ACM, vol.
[75] Inventor: Nobuyuki Igata, Kawasaki, Japan 18, No. 6, Jun., 1975, pp. 333—340.
[73] Assignee: Fujitsu Limited, Kawasaki, Japan Daniel M. Sunday, “A Very Fast Substring Search Algo
rithm”, Communications of the ACM, vol. 33, No. 8, Aug.,
[21] Appl. No.: 08/773,295 1990, pp. 133—143.
[22] Filed: Dec. 24, 1996
N. Uratani, “A Fast Algorithm for Matching Multiple Pat
[30] Foreign Application Priority Data terns”, Transactions of Information Processing Society of
Japan, vol. 30, No. 9, Sep. 1989, pp. 1120—1123.
Jan. 16, 1996 [JP] Japan .................................. .. 8-005236
[51] Int. Cl.6 .................................................... .. G06F 17/30
[52] 707/6; 707/3; 707/5; 707/7 Primary Examiner—Thomas G. Black
[58] Field of Search .................................. .. 707/3, 6, 7, 5; Assistant Examiner—Diane D. MiZrahi
395/800.19; 345/326
Attorney, Agent, or Firm—Staas & Halsey, LLP
[56] References Cited
[57] ABSTRACT
U.S. PATENT DOCUMENTS
A search method selecting unit included in a pattern search
4,916,655 4/1990 Ohsone ..................................... .. 707/6
4,991,087 2/1991 Burkowski 707/3 apparatus can automatically select a search method With the
5,440,482 8/1995 Davis ......... .. 707/6 highest search speed from a plurality of search methods
5,544,049 8/1996 Henderson 707/7
according to the number of search patterns, form, etc., in
5,675,819 10/1997 SchuetZe .... .. .. 707/3
5,680,612 10/1997 Asada ..................................... 707/3 order to ?nd a search pattern in a search target. An optimum
OTHER PUBLICATIONS search or replacement can be realized by ?nding or replacing
the search pattern using the selected method.
Robert S. Boyer et al., “A Fast String Searching Algorithm”,
Communications of the ACM, vol. 20, No. 10, Oct., 1977,
pp. 762—772. 29 Claims, 35 Drawing Sheets
PATTERN SEARCH APPARATUS
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SEARCH RETITCC SELECTINC UNIT
U.S. Patent 0a. 5, 1999 Sheet 1 0f35 5,963,942
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