Google Cloud Dataprep Documentation Documentation before Parameter A pattern identifier that occurs after the value or pattern to match. Define the pattern using string literals, regular expressions, or Cloud Dataprep patterns. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated January 23, 2018.