How classification rules work with xls-files stored in blob storage

Hi DebbieH,

Classification rules are applied based on the RegEx pattern using data pattern and/or column pattern. 

Distinct match threshold is the total number of "distinct data values" that need to be found in a column before the scanner runs the data pattern on it. Minimum match threshold is the minimum percentage of data value matches in a column that must be found by the scanner for the classification to be applied.

Relevant documentation: https://docs.microsoft.com/en-us/azure/purview/supported-classifications