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Regression testing is the re-testing of program elements that have already been tested once, following changes to the source code. The purpose is to make sure that these components still work as specified, and that the changes made have not introduced new "bugs" to the program.
A code review is a process in which the program's code is evaluated with respect to its efficiency (are algorithms, for example, written as efficiently as possible?), and to ensure that it meets any applicable in-house coding standards. This will hopefully result in fully optimised code, and reduce the incidence of bad coding practice. File handling procedures that do not clean up after themselves by closing the affected files, for example, should be flagged up and corrected. The inclusion of adequate commenting is another factor that should be checked.