in sql2019book/ch5_modern_development_platform/java/RegexSample.java [13:18]
public RegexSample() {
// Setup the expected extension version, and class to use for input and output dataset
executorExtensionVersion = SQLSERVER_JAVA_LANG_EXTENSION_V1;
executorInputDatasetClassName = PrimitiveDataset.class.getName();
executorOutputDatasetClassName = PrimitiveDataset.class.getName();
}