Why we do functional /regression testing after sanity testing where we perform the same functional/regression tests on the build in sanity testing?

I am trying to understand the exact difference between sanity testing and regression testing.  In sanity testing if the tester is testing the whole functionality of the build in depth and try to identify and fix the bugs and test whether this fixes of  bugs or change in the code or functionality have any effect on other functionalities then why there is a need to do a detailed functional and /or regression testing on the build after sanity testing as we are performing the same kind of tasks and testing in sanity testing.

Default Asked on November 13, 2018 in Software Testing.
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