How did you select cases for regression?

When selecting cases for regression testing, I focus on the following criteria:

• Critical business functions that must operate without failures.
• Functionality that has been changed in recent releases.
• Frequently used user scenarios.
• Bugs that have occurred in the past to verify their fixes.
• Interactions between modules where changes could affect other parts of the system.

This approach helps effectively cover risks and minimize the likelihood of regressions in the product.