Multiple string searching using ternary content addressable memory
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United States of America Patent
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Jun 28, 2011
Grant Date -
Jan 8, 2009
app pub date -
Sep 16, 2008
filing date -
Nov 3, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed herein is a method and apparatus for multiple string searching using a ternary content addressable memory. The method includes receiving a text string having a plurality of characters and performing an unanchored search of a database of stored patterns matching one or more characters of the text string using a state machine, wherein the state machine comprises a ternary content addressable memory (CAM) and wherein the performing comprises comparing a state and one of the plurality of characters with contents of a state field and a character field, respectively, stored in the ternary CAM. In the method and apparatus described herein, one or more of the following search features may be supported: exact string matching, inexact string matching, single character wildcard matching, multiple character wildcard matching, case insensitive matching, parallel matching and rollback.
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