Short lived hadronic resonances are sensitive to the properties of the medium created in heavy-ion collisions, in particular to the temperature, density and expansion velocity. I will discuss the re-scattering and regeneration in a hadronic evolution stage and its relation to the lifetime of the hadronic phase and its system size dependence. I will present the results from the ALICE experiment from pp and Pb-Pb collisions and compare it to measurements from RHIC energies.