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API Docs - v4.0.5

Regex

lookingAt (Function)

This method attempts to match the 'inputSequence', starting at the beginning, against the 'regex' pattern.

Syntax

<BOOL> regex:lookingAt(<STRING> regex, <STRING> input.sequence)

QUERY PARAMETERS

Name	Description	Default Value	Possible Data Types	Optional	Dynamic
regex	regular expression. eg: \d\d(.*)WSO2.		STRING	No	No
input.sequence	input sequence to be matched with the regular expression eg: 21 products are produced by WSO2.		STRING	No	No

Examples EXAMPLE 1

define stream inputStream (inputSequence string, price long, regex string, group int);

from inputStream select inputSequence, regex:lookingAt(\d\d(.*)(WSO2.*), 21 products are produced by WSO2 currently in Sri Lanka)

This method attempts to match the inputSequence against \d\d(.*)(WSO2.*) regex pattern starting at the beginning. Since it matches, returns true.

EXAMPLE 2

define stream inputStream (inputSequence string, price long, regex string, group int);

from inputStream select inputSequence, regex:lookingAt(WSO2(.*)middleware(.*), sample test string and WSO2 is situated in trace and its a middleware company)

This method attempts to match the inputSequence against WSO2(.*)middleware(.*) regex pattern starting at the beginning. Since it does not match, returns false.

find (Function)

These methods attempts to find the next sub-sequence of the 'inputSequence' that matches the 'regex' pattern.

Syntax

<BOOL> regex:find(<STRING> regex, <STRING> input.sequence, <INT> starting.index)

QUERY PARAMETERS

Name	Description	Default Value	Possible Data Types	Optional	Dynamic
regex	regular expression. eg: \d\d(.*)WSO2.		STRING	No	No
input.sequence	input sequence to be matched with the regular expression eg: 21 products are produced by WSO2.		STRING	No	No
starting.index	starting index of the input sequence to start matching the given regex pattern eg: 1, 2.		INT	No	No

Examples EXAMPLE 1

define stream inputStream (inputSequence string, price long, regex string);

from inputStream select inputSequence , regex:find(\d\d(.*)WSO2, 21 products are produced by WSO2 currently) as aboutWSO2 insert into outputStream;

This method attempts to find the next sub-sequence of the inputSequence that matches \d\d(.*)WSO2 regex pattern. It returns true as the sub sequence exists.

EXAMPLE 2

define stream inputStream (inputSequence string, price long, regex string);

from inputStream select inputSequence , regex:find(\d\d(.*)WSO2, 21 products are produced currently) as aboutWSO2 insert into outputStream;

This method attempts to find the next sub-sequence of the inputSequence that matches \d\d(.*)WSO2 regex pattern. It returns false as the sub sequence does not exists.

EXAMPLE 3

define stream inputStream (inputSequence string, price long, regex string);

from inputStream select inputSequence , regex:find(\d\d(.*)WSO2, 21 products are produced within 10 years by WSO2 currently by WSO2 employees, 30) as aboutWSO2 insert into outputStream;

This method attempts to find the next sub-sequence of the inputSequence that matches \d\d(.*)WSO2 regex pattern starting from index 30. It returns true since such a sub sequence exists.

matches (Function)

This method attempts to match the entire 'inputSequence' against the 'regex' pattern.

Syntax

<BOOL> regex:matches(<STRING> regex, <STRING> input.sequence)

QUERY PARAMETERS

Name	Description	Default Value	Possible Data Types	Optional	Dynamic
regex	regular expression. eg: \d\d(.*)WSO2.		STRING	No	No
input.sequence	input sequence to be matched with the regular expression eg: 21 products are produced by WSO2.		STRING	No	No

Examples EXAMPLE 1

define stream inputStream (inputSequence string, price long, regex string, group int);

from inputStream select inputSequence, regex:matches(WSO2(.*)middleware(.*), WSO2 is situated in trace and its a middleware company)

This method attempts to match the entire inputSequence against WSO2(.*)middleware(.*) regex pattern. Since it matches, it returns true.

EXAMPLE 2

define stream inputStream (inputSequence string, price long, regex string, group int);

from inputStream select inputSequence, regex:matches(WSO2(.*)middleware, WSO2 is situated in trace and its a middleware company)

This method attempts to match the entire inputSequence against WSO2(.*)middleware regex pattern. Since it does not match, it returns false.

group (Function)

This method returns the input sub-sequence captured by the given group during the previous match operation.

Syntax

<STRING> regex:group(<STRING> regex, <STRING> input.sequence, <INT> group.id)

QUERY PARAMETERS

Name	Description	Default Value	Possible Data Types	Optional	Dynamic
regex	regular expression. eg: \d\d(.*)WSO2.		STRING	No	No
input.sequence	input sequence to be matched with the regular expression eg: 21 products are produced by WSO2.		STRING	No	No
group.id	the given group id of the regex expression eg: 0, 1, 2, etc.		INT	No	No

Examples EXAMPLE 1

define stream inputStream (inputSequence string, price long, regex string, group int);

from inputStream select inputSequence, regex:group(\d\d(.*)(WSO2.*), 21 products are produced within 10 years by WSO2 currently by WSO2 employees, 3) 
 insert into outputStream;

Returns 'WSO2 employees', input sub-sequence captured by the given groupID, 3 during the previous match operation.