I want to know the answer to the following question:
What happens to software after a major change in code that leads to regression??
All the background I'm provided with is that "Regression testing is typically the largest test effort in commercial software development, due to checking numerous details in prior software features, and even new software can be developed while using some old test-cases to test parts of the new design to ensure prior functionality is still supported.". Is that enough to answer the question?
Answer: no