  In this article we discuss a star generated by some matter fluid, whose
stress-energy tensor is known. We investigate both the maximally symmetric
framework, where all the pressures are equal, and the dark energy framework,
with $P = -\rho$. We show that the first one is not able to produce a black
hole, while second one actually is. Finally, within this second framework, we
present an example of regular black hole, showing it satisfies the NEC and the
WEC.
