Español – América Latina Português – Brasil Set up & manage services Google Workspace Help

Set up & manage services To create a regular expression, you must use specific syntax—that is, special characters and construction rules. For example, the following is a simple regular expression that matches any 10-digit telephone number, in the pattern nnn-nnn-nnnn: The following table describes some of the most common special characters for use in regular expressions. These characters are categorized as follows: Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License , and code samples are licensed under the Apache 2.0 License . For details, see the Google Developers Site Policies . Java is a registered trademark of Oracle and/or its affiliates. Last updated 2026-08-26 UTC.