  In this paper for variety types of regular black hole solutions, we
investigate the entropy product of inner and outer horizons. Similar to
singular black holes, for the regular ones we find that universality (mass
independence) of the entropy product is true for some solutions and it fails
for some others. In the case of regular black holes that respect the
universality, we read central charges of the dual CFTs from the entropy
product, according to the Thermodynamics method introduced in
\cite{Chen:2013rb}. For these solutions we also calculate central charges,
using the asymptotic symmetry group formalism. The results of these two
approaches are the same, which means that universality of the entropy product
provides a simple method to find central charges of the dual CFTs.
