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Identifying Sub-sequences in Input Sequences

Purpose:¶

This function 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

Prerequisites:¶

Save this sample. If there is no syntax error, the following messages would be shown on the console.

* Siddhi App RegexExecutionSample successfully deployed.

Executing the Sample:¶

Start the Siddhi application by clicking on 'Run'.
If the Siddhi application starts successfully, the following messages would be shown on the console.
```
* RegexExecutionSample.siddhi - Started Successfully!
```

Testing the Sample:¶

You can publish data event to the file, through event simulator.

Open event simulator by clicking on the second icon or press Ctrl+Shift+I.
In the Single Simulation tab of the panel, select values as follows:
- Siddhi App Name : RegexExecutionSample
- Stream Name : SweetProductionStream
Enter following values in the fields and send,
```
name: chocolate cake
startingIndex: 0
```
Enter following values in the fields and send
```
name: coffee cake
startingIndex: 0
```

Viewing the Results:¶

Messages similar to the following would be shown on the console.

INFO {io.siddhi.core.stream.output.sink.LogSink} - RegexExecutionSample : ChocolateProductStream : Event{timestamp=1513759840093, data=[chocolate cake, true], isExpired=false}
INFO {io.siddhi.core.stream.output.sink.LogSink} - RegexExecutionSample : ChocolateProductStream : Event{timestamp=1513759907324, data=[coffee cake, false], isExpired=false}

@App:name("RegexExecutionSample")
@App:description('Finds if a sweet is a chocolate product.')


define stream SweetProductionStream (name string, startingIndex int);

@sink(type='log')
define stream ChocolateProductStream(name string, isAChocolateProduct bool);

from SweetProductionStream
select name, regex:find("^chocolate(\s*[a-zA-Z]+)", str:lower(name), startingIndex) as isAChocolateProduct
insert into ChocolateProductStream;

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