various regression testing techniques are:

Retest all

This technique checks all the test cases on the current program to check its integrity. Though it is expensive as it needs to re-run all the test cases, it ensures that there are no errors because of the modified code.

Regression test selection

Unlike Retest all, this technique runs a part of the test suite (owing to the cost of retest all) if the cost of selecting the part of the test suite is less than the Retest all

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