  In this paper, we investigate a class of doubly nonlinear evolutions PDEs. We
establish sharp regularity for the solutions in H\"older spaces. The proof is
based on the geometric tangential method and intrinsic scaling technique. Our
findings extend and recover the results in the context of the classical
evolution PDEs with singular signature via a unified treatment in the slow,
normal and fast diffusion regimes. In addition, we provide some applications to
certain nonlinear evolution models, which may have their own mathematical
interest.

Analysis of PDEs