The latest version for DAS is WSO2 Data Analytics Server 3.1.0. View documentation for the latest release.
WSO2 Data Analytics Server is succeeded by WSO2 Stream Processor. To view the latest documentation for WSO2 SP, see WSO2 Stream Processor Documentation.

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This extension provides basic RegEx execution capabilities to Siddhi. Following are the functions of the RegEx extension.

Find function

Syntax<bool> regex:find (<string> regex , <string> inputSequence )
Extension TypeFunction
DescriptionThis method attempts to find the next sub-sequence of the  inputSequence  that matches the  regex  pattern. It returns true if such a sub sequence exists, or returns false otherwise.
Examples
  • find("\d\d(.*)WSO2", "21 products are produced by WSO2 currently") returns true.
  • find("\d\d(.*)WSO2", "21 products are produced currently") returns false.
Syntax<bool> regex: find (<string> regex , <string> inputSequence, <int> startingIndex )
Extension TypeFunction
DescriptionThis method attempts to find the next sub-sequence of the  inputSequence  that matches the  regex  pattern starting from given index (i.e.  startingIndex ). It returns true if such a sub sequence exists, or returns false otherwise.
Examples
  • find("\d\d(.*)WSO2", "21 products are produced within 10 years by WSO2 currently by WSO2 employees",  30) returns true.
  • find("\d\d(.*)WSO2", "21 products are produced within 10 years by WSO2 currently by WSO2 employees", 35) returns false.


Group function

Syntax<string> regex: group (<string> regex , <string> inputSequence , <int>  groupId )
Extension TypeFunction
DescriptionReturns the input sub-sequence captured by the given group during the previous match operation. Returns null if no sub-sequence was found during the previous match operation. For more information about the match operation, see matches.
Example group("(\d\d)(.*)(WSO2.*)", "21 products are produced within 10 years by WSO2 currently by WSO2 employees", 3) returns "WSO2 employees".


Looking At function

Syntax<string> regex: lookingAt (<string> regex , <string> inputSequence )
Extension TypeFunction
DescriptionThis method attempts to match the  inputSequence  against the  regex  pattern starting at the beginning.
Examples
  • lookingAt("\d\d(.*)WSO2", "21 products are produced by WSO2 currently in Sri Lanka") returns true.
  • lookingAt("WSO2(.*)middleware(.*)", "sample test string and WSO2 is situated in trace and its a middleware company") returns false.


Matches function

Syntax<string> regex: matches (<string> regex , <string> inputSequence )
Extension TypeFunction
DescriptionThis method attempts to match the entire  inputSequence  against the  regex  pattern.
Examples
  • matches("WSO2(.*)middleware(.*)", "WSO2 is situated in trace and its a middleware company") returns true.
  • matches("WSO2(.*)middleware", "WSO2 is situated in trace and its a middleware company") returns false.
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