JPS63257030A - Character string retrieving circuit - Google Patents

Abstract

PURPOSE:To shorten a retrieval time, by providing a means which selects the decision processing of a retrieval condition decision part after the collation of an input character string or in the middle way of the collation. CONSTITUTION:A character retrieval circuit is constituted of a character collation part 1, a collation result latch part 2, a retrieval condition decision part 3, and a control part 4 which controls the parts 1-3 and includes a selection means. The selection means controls the decision part 3 by analyzing a retrieval condition inputted from the outside via a command line 17, detecting the case of the retrieval condition whose retrieved result is recognized in the middle way of the collation of the input character string, and outputting a selection signal to perform decision at the decision part 3 at every character of the input character string, or after completing the collation of the input character string to a signal line 15. In such a way, in a case where it is enough to satisfy either two conditions in one character string, it is possible to interrupt a collation processing at a time when either is satisfied without performing the retrieval of another condition, thereby, it is possible to perform the retrieval processing at high speed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a character string search circuit, and particularly to a character string search circuit suitable for application to a search process in which a character string is searched by combining a plurality of search conditions. Regarding circuits.

[Conventional technology]

For example, as the amount of information increases due to more efficient office processing, there is a demand for more efficient search processing for target character information in databases that store a large amount of character information.

In response to these demands, Japanese Patent Laid-Open Publication No. 2006-1993 has developed a technology that aims to achieve faster processing and higher functionality by using specialized hardware to search for character strings and sentences stored in databases. 61>105039 is known.

The outline is that by using a match judgment table together with a state transition table related to a finite automaton that performs search processing, it is possible to continuously match an input string with multiple types of substrings registered in the state transition table. It made it possible.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, in a search in which a search condition is given by the logical product or logical sum of multiple substring matching results, or a combination thereof, it is possible to determine that the search condition is met during matching of the input string. Verification processing in such cases is not considered.

In other words, in general character string searches, input character strings are not limited to relatively short character strings such as names and addresses;
It is possible to target long character strings in sentence format,
In such a case, if the matching process is performed until the end of the input character string regardless of the type of search condition, a problem arises in that the processing time increases more than necessary.

An object of the present invention is to provide a character string search circuit that can shorten the time required to search for two or more target partial character strings in an input character string.

[Means for solving problems]

The present invention provides a string matching section that matches an input string with two or more target substrings, a matching result latch section that holds the matching result output of the string matching section, and an output of the matching result latch section. and a search condition determination unit that receives as input and determines whether or not a predetermined search condition is met based on the AND or OR of the matching results of two or more types of partial strings, or a combination thereof. In the present invention, a selection means is provided which can select whether the determination process by the search condition determination unit is performed after collation of input character strings or during the collation of human and hojo character strings.

[Effect]

According to the above-mentioned means, depending on the type of search conditions for multiple types of target substrings, for example, if it can be determined that the input string matches the search conditions during matching of the input string, the input The search can be immediately terminated by aborting the matching operation for the remaining part of the string. in particular,
If either one of the two conditions needs to be satisfied in one character string, the inquiry is terminated without searching for the other one when either one is satisfied. As a result, the time required for a search can be shortened compared to a case where matching is performed until the end of an input character string regardless of the type of search condition.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1(a) is a block diagram of a character string search circuit showing an embodiment of the present invention, FIG. FIG. 2 is a diagram illustrating the relationship between the operations of each part.

As shown in FIG. 1(a), the character string search circuit of this embodiment includes a character string matching section 1, a matching result latch section 2, and a search condition determining section 3. are configured to be centrally controlled by the control section 4.

The character string collation unit 1 receives an input character string input from an external storage device (not shown) via a data line 5, and a control unit 4.
, and a plurality of target partial character strings set via control lines 12, and the results of the comparison are sent to a plurality of signal lines 6. Signal line 7. It is configured to transmit the verification result to the latch section 2 via the signal line 8.

In the case of this embodiment, for convenience of explanation, an example will be described in which three signal lines 6, 7.8 are provided corresponding to each of three types of partial character strings.

In the matching result latch unit 2, in response to a command from the control unit 4 via the control line 13, a plurality of partial character strings input from the preceding character string matching unit 1 via a plurality of signal lines 6, 7, and 8 are processed. The matching results between each of the input character strings and the input character string are individually held, and the held matching results are transmitted to the plurality of signal lines 6.
, 7.8, a plurality of signal lines 9. Signal line 10. This is input to the search condition determining section 3 via the signal line 11.

A control line 14 and a control line 15 are connected to the search condition determination unit 3 from the control unit 4, and when a command signal of “l” level is input from the control unit 4 via the control line 15, the search condition determination unit 3 from the verification result latch unit 2 to the plurality of signal lines 9, 1
The matching result for each of the plurality of partial character strings input via the control line 14 is determined based on the search conditions set via the control line 14, and this determination result is transmitted to the signal line 16.
The information is transmitted to the control section 4 via the "structure".

Further, a search operation start command, search conditions, etc. are input to the control unit 4 from a higher-level control device (not shown) via a command line 17, and a signal line is input from the search condition determination unit 3. The determination result obtained by the control section 4 via the control section 16 is transmitted from the control section 4 to a higher-order control device (not shown) via a response line 18.

In addition, a control line 19 is connected from the control unit 4 to a storage device (not shown) that inputs the input string to the character string matching unit 1 via the data line 5, and the timing for starting input of the input string is controlled. configured to be controlled.

In addition, as the character string collation unit 1, for example,
The material disclosed in Japanese Patent No. 105039 can be used. Further, the search condition determination unit 3 determines whether a search condition given by the AND or OR of a plurality of elements or a combination thereof matches the matching result of the character string, and is disclosed in Japanese Patent Laid-Open No. 56-145428. A combination of the AND circuit group and the OR circuit group disclosed in the publication can be used.

In this case, the control unit 4 between the command line 17 for instructing the control unit 4 to start a search operation, search conditions, etc. from the outside and the control line 15 for starting the search condition determination unit 3 is connected to the control unit 4 as shown in FIG. A selection means S as shown in (b) is provided.

This selection means S analyzes the search conditions given from the outside via the command line 17, and outputs a "1" level to the control line 31 if the search conditions are such that the search result becomes clear during the collation of the input character string. , an analysis unit 20 that outputs a “0” level when the search result is known after the completion of matching the input string;
In addition to outputting the first timing signal of "1" level, "1" is output to the signal line 33 at the end of matching one input character string.
A timing signal generation section 21 that outputs a second timing signal of "level", and a first AND circuit 22 that takes an AND of the input from the analysis section 20 and the first timing signal from the timing signal generation section 21. and a second AND circuit 23 which calculates the AND of the negation of the input from the analysis section 20 inputted via the NOT circuit 24 and the second timing signal from the timing signal generation section 21; The logical sum circuit 25 outputs the logical sum of the inputs from the logical product circuit 22 and the second logical product circuit 23 to the control line 15.

The signal line 15 includes a command line 1 in the control line 31.
According to the signal level of "1" or "0" corresponding to the search condition from 7, the "l" level on either the signal line 32 or 33 is output, and the judgment in the search condition judgment section 3 is made based on the input character. It is possible to select whether to perform this for each character in the string or after the completion of collation of the input character string.

The operation of this embodiment will be explained below.

First, the search condition commanded via the command line 17 is [Input character string contains partial character strings “ABC” and “DE”.
, or the substrings "ABC' and QR'exist."

Expressing this as a logical formula, x= (xl ・X2)v (xl ・x3)
・ ・ ・(1) becomes.

Here, xl is the character string “ABC”, x2 is “D”
E' and X3 represent the discovery of QR', respectively, "." represents a logical product, and "V" represents a logical sum.

Upon receiving the command of the above search condition, the control unit 4 sets the plurality of signal lines 6, 7.8 to XI l X21 X3 of formula (1).
The character string matching section 1 is set so as to correspond to each of
The search condition determination unit 3 is set to correspond to x2 + x, respectively.

Furthermore, in the control unit 4, the search condition shown by the above formula (1) is set to (X, ・X2) or (XI・X
3) is recognized to be satisfied when one of the conditions is satisfied, and in the selection means S, the control line 31 is outputted with a “1” level, and the control line 15 is output with the timing signal generator 21 outputting a “1” level. "Bill bell" is output on the signal line 32, and the search condition determining unit 3 is set to be activated every time one character is processed.

FIG. 2 is a diagram showing the operation when performing a search using the search condition of formula (1) in this embodiment. "1" level is output to the signal line 15, and every time the character string matching unit 1 processes one character, the signal line 13
Every time the latch command signal in is outputted, the "1" level is outputted as a control signal for activating the search condition determining section 3.

The character string matching section 1 outputs a "1" level to the signal line 7 when it finds the character string 'DE', and outputs a "1'° level to the signal line 6 when it finds the character string 'ABC°."

These signals are held in the signal lines 9 and 10 as "1" level via the verification result latch section 2 in response to a command from the control line 13.

The search condition determining unit 3 determines that the output levels of the signal lines 9, 10, and 11 match the search condition every time a level "1" is output to the control line 15, that is, every time a character in the input string is compared. After the outputs on signal lines 9 and 10 both reach the 1″ level, the control signal line 15
When the “1” level is input via
Immediately at the time point indicated by
It is output to the control section 4 via.

The control unit 4 recognizes that the search condition is satisfied by the “1” level input from the signal line 16, terminates the search process for the input character string, and sends a “1” to the response line 18.
``By outputting the label, it is transmitted to a higher-level control device (not shown) that the input character string matches the search conditions and that the search process for the input character string has been completed.

As described above, in this embodiment, in the case of search conditions such that the search result is known during the matching operation, the selection means S provided in the control unit 4 selects the input character string after the search result is known. Since it is possible to abort wasteful matching operations for , the time required for search processing can be shortened.

This is particularly effective when a large number of long input character strings are to be searched consecutively using one type of search condition.

Furthermore, if the search condition includes the condition that a specific character string does not exist, as shown in formula (2),
It is essential to collate the input character string to the end, and at this time, the analysis section 20 in the selection means S outputs the "0" level to the control line 31, and the control line 15 outputs the "0" level.
“1” in the signal line 33 of the timing signal generator 21
The level is output, and the search condition determination unit 3 is activated after a series of input character strings are collated.

x-(r-r ・X2)V (XI-X3)
...(2) In the above explanation, the search condition determination unit 3 is started every time one character is processed, but it is difficult to make a determination for each character processing due to constraints such as the processing speed of the search condition determination unit 3. In such a case, the search condition determination unit 3 may be activated at any time during the collation of the input character string, for example, every time two characters are processed.

[Effects of the Invention] According to the present invention, there is provided a character string matching unit that matches an input character string with two or more target substrings, and a matching result latch unit that holds the matching result output of the string matching unit. and the output of the matching result latch unit as input, and a search that determines whether or not a search condition given in advance is met by the AND or OR of the matching results of two or more types of partial character strings, or a combination thereof. In the character string search circuit having a condition determination unit, it is possible to select whether the determination process by the search condition determination unit is performed after collation of the input character string or in the middle of collation of the input character string. Since it is equipped with a selection means, depending on the type of search conditions for multiple types of target substrings, for example, if it is determined that the search conditions match the input string, the corresponding The search can be immediately terminated by aborting the matching operation for the remaining part of the input string, reducing the time required for the search compared to cases where matching is performed to the end of the input string regardless of the type of search condition. Can be shortened.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram of a character string search circuit showing an embodiment of the present invention, FIG. FIG. 1... Character string matching section, 2... Matching result latch section, 3
...Search condition determination unit, 4...Control unit, 5...Data line, 6, 7.8...Signal line, 9゜10.11...
Signal line, 12, 13.14.15... Control line, 16.
...Signal line, 17...Command line, 18...Response line, 1
9... Control line, 20... Analysis section, 21... Timing signal generation section, 22... First AND circuit, 23.
...Second AND circuit, 24...Negation circuit, 25...
・OR circuit, 31...control line, 32.33...signal line, 41...startup of search condition determination section Figure 1 (Q) (b) Figure 2 input character string

Claims (1)

[Claims] 1. A character string matching section that matches an input string with two or more target substrings; a matching result latch section that holds the matching result output of the string matching section; a search condition determining unit that receives the output of the matching result latch unit as input and determines whether or not a search condition given in advance is met based on the AND or OR of the matching results of two or more types of partial character strings, or a combination thereof; A character string search circuit having a character string search circuit, wherein the determination process by the search condition determining unit is selective between performing the determination process after collating the input character string and performing the determination process during collation of the input character string. A character string search circuit characterized by comprising means. 2. The selection means analyzes the search condition given from the outside, and outputs a level "1" if the search condition is such that the search result is known during the collation of the input character string, and the search condition is determined after the collation. an analysis unit that outputs a “0” level if it is found; and an analysis unit that outputs a first timing signal of a “1” level every time one character in the input string is compared, and an analysis unit that outputs a “1” level first timing signal every time a character in the input string is compared; “1” level 2nd
a timing signal generator that outputs a timing signal;
a first AND circuit that takes an AND of the input from the analysis section and a first timing signal from the timing signal generation section; A patent claim characterized in that the invention comprises a second AND circuit that takes an AND with two timing signals, and an OR circuit that outputs the OR of inputs from the first and second AND circuits. The character string search circuit according to the first item in the range.