GitHub Advanced Security customers can now dry run custom secret scanning patterns at the repository level. Dry runs allow admins to review and hone their patterns before publishing them and generating alerts.
Admins can compose a pattern then 'Save and dry run' to retrieve results from their repository. The scans are fast – typically just a few seconds – but GitHub will also notify admins via email when dry run results are ready. Organization and enterprise-level dry runs will follow shortly.
For more information: