Google Cloud Dataprep Documentation Documentation on Parameter Identifies the pattern to match. Pattern can be a string literal, Cloud Dataprep pattern, or regular expression pattern. 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.