Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multiple character string matching method and chip

A string matching and character technology, applied in the field of information processing, can solve the problems of slow matching speed, impracticality, obvious impact on storage space, etc., to achieve the effect of reducing space requirements and solving the problem of space explosion

Inactive Publication Date: 2009-06-03
BEIJING ZHEAN TECH CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional algorithm can support multi-string matching for a large-scale rule base, it has a significant impact on storage space, reduces the matching speed, and is generally not practical

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multiple character string matching method and chip
  • Multiple character string matching method and chip
  • Multiple character string matching method and chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This embodiment provides a method for matching multiple character strings, which is specifically based on the principle of a cache state machine and is mainly characterized by eliminating cross conversion rules. At the same time, this method can also completely eliminate restart conversion rules and failure conversion rules. see Figure 5 , with the current state S i , the current input is K, and the storage state number N=1 is taken as an example for illustration, the method includes the following steps:

[0079] Step 101: Define the cache rules of the cache state machine, that is, the cache state function, according to the application situation.

[0080] The cache rule of this embodiment is specifically described by the cache state function (ie θ), specifically: after the current state receives the current character, if the initial state S 0 Receive the current character and have the next state in the basic conversion rule, then store the next state in the cache C ...

Embodiment 2

[0098] This embodiment provides a multi-character string matching method, which is based on the cache state machine principle and mainly features the isomorphic path merging technology, a multi-character string matching method.

[0099] First, merge the existing basic transformation rules into isomorphic paths, taking P={betters, pattern} as an example, see Figure 8, the DFA graph constructed for the AC algorithm (which does not include restart transition rules and failure transition rules), requires a total of 14 basic transition rules and 15 states, and the state S 2 -S 5 with state S 9 -S 12 have the same property, that is, they all receive the string "tter", and this form is called an isomorphic path. For isomorphic paths, cache state machines are used to merge them.

[0100] see Figure 9 ,for Figure 8 Schematic diagram of the merged cache state machine, which aggregates the next state into one state S 1 and state S 8 Called the convergent state, the next state ...

Embodiment 3

[0113] see Figure 10 , the embodiment provides a multi-character string matching chip, the chip includes: an interface module, a status register, a cache status register, a conversion rule module and a control module.

[0114] Wherein, the interface module is used for receiving input characters;

[0115] The state register is used to store the current state;

[0116] The cache state register is used to store the cache state, and there are N cache states, and N can be 1 or other values;

[0117] The conversion rule module is used for storing the state conversion rule base, and searches for the next state according to the character received by the interface module, the current state stored in the state register and the cache state stored in the cache state register;

[0118] The control module is used to control the interface module to normally receive input characters, control the status register to update the current status, control the cache status register to update the b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for matching multi-character includes seeking next state in conversion rule library according to current state and buffer storage state as ell as current character after current character is received, using state stored according to preset buffer storage rule as said buffer storage state, jumping to next state if seeking is successful, using said next state as current state and repeating above said steps till there is no character to be inputted. The chip used for realizing said method is also disclosed.

Description

technical field [0001] The invention relates to the field of information processing, in particular to a multi-character string matching method and a chip. Background technique [0002] Multi-string matching technology, also called multi-keyword matching technology, has been relatively mature and widely used in many fields such as text processing and content filtering. This technology can find one or more of a pre-defined set of strings in the one-dimensional content to be matched. The processed intermediate data structure performs content matching, so as to realize the matching of a set of predefined character strings. [0003] The performance of the multi-string matching algorithm is mainly affected by the following aspects: the number of string sets (also called rule sets, feature sets, keyword sets), the minimum length of the string set, the possibility of matching in the text to be matched, etc. . According to the different preprocessing methods of string sets by mult...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30
CPCG06F17/30985G06F16/90344
Inventor 嵩天
Owner BEIJING ZHEAN TECH CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com