  We consider the strongly convergent modified versions of the
Krasnosel'ski\u{\i}-Mann, the forward-backward and the Douglas-Rachford
algorithms with Tikhonov regularization terms, introduced by Radu Bo\c{t},
Ern\"{o} Csetnek and Dennis Meier. We obtain quantitative information for these
modified iterations, namely rates of asymptotic regularity and metastability.
Furthermore, our arguments avoid the use of sequential weak compactness and use
only a weak form of the projection argument.
