Explanation:
Box 1: Yes
Prd:1234 will match the regular expression of SIT1.
Box 2: Yes
111-111-1111 will match the exclusion of SIT2.
However, 123456789012 will match the regular expression of SIT2.
Box 3: No
The full credit card number is not inclued in Email3.
Note:
Sensitive information types (SIT) can use functions as primary elements for identifying sensitive items. For example, the Credit Card Number SIT uses the Func_credit_card function to detect credit card number.
Reference:
https://learn.microsoft.com/en-us/purview/sit-regex-validators-additional-checks#sensitive- information-type-regular-expression-validators
https://learn.microsoft.com/en-us/purview/sit-functions

Explanation:
Box 1: Content Explorer
Increase classifier accuracy
Classifiers, like sensitive information types (SIT) and trainable classifiers are used in various kinds of policies to identify sensitive information. Like most such models, sometimes they identify an item as being sensitive that isn't. Or, they may not identify an item as being sensitive when it actually is. These are called false positives and false negatives.
Box 2: Compliance data administrator
Permissions
In order to get access to the content explorer tab, an account must be assigned membership in any one of these roles or role groups.
Microsoft 365 role groups
Global administrator
Compliance administrator
Security administrator
*-> Compliance data administrator
Reference:
https://learn.microsoft.com/en-us/microsoft-365/compliance/data-classification-increase-accuracy
https://learn.microsoft.com/en-us/microsoft-365/compliance/data-classification-content-explorer

To implement insider risk management for users managing sensitive project data while minimizing the impact on other users and reducing administrative effort, you should first create a security group in Microsoft Entra ID (formerly Azure AD).
Security groups allow you to scope insider risk management policies to specific users instead of applying policies to all users, which helps in minimizing unnecessary alerts and reducing administrative overhead. After creating the security group, you can assign this group to a Microsoft Purview Insider Risk Management policy, ensuring that only project-related users are affected.