  We calculate four classes of high energy massive string scattering amplitudes
of fermionic string theory at arbitrary mass levels in the Regge regime (RR).
We show that all four leading order amplitudes in the RR can be expressed in
terms of the Kummer function of the second kind. Based on the summation
algorithm of a set of extended signed Stirling number identities, we show that
all four ratios calculated previously by the method of decoupling of zero-norm
states among scattering amplitudes in the Gross Regime (GR) can be extracted
from this Kummer function in the RR. Finally, we conjecture and give evidences
that the existence of these four GR ratios in the RR persists to subleading
orders in the Regge expansion of all high energy fermionic string scattering
amplitudes.
