Starting April 21st, 2025, we are switching to RE2 as our regular expression engine, specifically the RE2JS npm package. This will enforce stricter validations for regular expressions in the Content Management API (CMA). From this date, you will no longer be able to publish entries with any regular expressions match or prohibit rules that are not accepted by the regular expression engine.

The previous date for this change was March 21st, 2025, however, to accommodate our customers' needs, we are pushing the date. For more information, see the previous changelog, and the Regular Expression (Regex) page.