RE2JS regular expression engine FAQs

After this date, entries containing unsupported regex validation rules will fail to publish. A warning message will be displayed in the web app prompting you to update your regular expressions.

Not all regex patterns will work as-is. RE2JS enforces stricter validation, which means you must modify patterns that rely on unsupported features. For more information, see the Regular Expression (Regex) page.

Warning messages and alerts will be displayed on the affected fields and content types in the web app prompting you to update your regular expressions.

1. Test your regex in the RE2JS Playground.

2. Check for unsupported features and modify accordingly.

3. Contact Customer Support or your CSM for help.

I received an error about an “unsupported regex feature.” What does this mean?

This means your regex includes a feature that RE2JS does not support (e.g., backreferences, lookaheads). You will need to modify the regex to comply with RE2JS rules.

Yes. However, you may need to modify your existing regex patterns. If you use password validation, email matching, or other regex-based input validation, please ensure they are RE2JS-compatible.