  Standard models of "regular black holes" typically have asymptotically de
Sitter regions at their cores. Herein we shall consider novel "hollow" regular
black holes, those with asymptotically Minkowski cores. The reason for doing so
is twofold: First, these models greatly simplify the physics in the deep core,
and second, one can trade off rather messy cubic and quartic polynomial
equations for somewhat more elegant special functions such as exponentials and
the increasingly important Lambert $W$ function. While these "hollow" regular
black holes share many features with the Bardeen/Hayward/Frolov regular black
holes there are also significant differences.
