The Field Calculator (Regular Expression) Processor can be used to leverage the power of regular expressions to identify a pattern within a target field and extract the substrings from received events. The extracted substrings are either written back to the target field, replacing the field's original value, or written to a new field. This processor does not support the general mathematical, lexical, and logical expressions supported by the Field Calculator Processor above.
Nota:
When specifying the Field Name parameter for this processor, do not forget to enclose the field name with ${…}. This is different than the Field Calculator Processor above, which expects GeoEvent field names without encasement.
Nota:
The Field Calculator (Regular Expression) Processor does not support back references within the specified regular expression pattern.
Writing a computed value to a new field alters the GeoEvent's schema, which requires the GeoEvent Server to create a new GeoEvent Definition. When using this processor to create new fields, a field name and data type must be specified. A name for the GeoEvent Definition can be specified as well as an optional tag, which, if specified, will be applied to the new field in the resulting GeoEvent Definition.