Re-Testing :Case 1: The repeating of same test for more than one time with multiple data is called "Re-Testing". Case 2: The re-execution of failed tests on modified build to ensure bug fixing work is called as “Re-Testing”. Regression Testing :The Re-execution of selected test or modified build, to check is there any side effects occurred or not on dependent functionalities by modifying reported defects or by adding new requirements.

Re-Testing: After a defect is detected and fixed, the software should be retested to confirm that the original defect has been successfully removed. This is called Confirmation Testing or Re-Testing Regression testing: Testing your software application when it undergoes a code change to ensure that the new code has not affected other parts of the software.

Regression testing: Testing your software application when it undergoes a code change to ensure that the new code has not affected other parts of the software.

Re-Testing: After a defect is detected and fixed, the software should be retested to confirm that the original defect has been successfully removed. This is called Confirmation Testing or Re-Testing

Re-Testing: After a defect is detected and fixed, the software should be retested to confirm that the original defect has been successfully removed. This is called Confirmation Testing or Re-TestingRegression testing: Testing your software application when it undergoes a code change to ensure that the new code has not affected other parts of the software

Re-testing is testing the fixed bugs with only fixed functionality. Regression testing is if any new module or bug is fixed we will be testing the scenario from the first where old system is not affected due to the newly implemented code.

Re testing means After debugging if any error occur ur testing application to ensure it will not comeand regression testing means after modification if any unchanged feature of application affected or not so regression testing done

http://www.softwaretestingclass.com/difference-between-regression-testing-vs-retesting/

http://www.softwaretestingclass.com/difference-between-regression-testing-vs-retesting/