  The present paper provides comprehensive description of various regimes
involved in the two-fluid model of the resistive tearing instability. These
include two novel regimes of this instability, which correspond to the
long-wave modes that can develop in a highly-elongated current sheet. This
issue is relevant to the study of fast magnetic reconnection and magnetic
turbulence in magnetohydrodynamic (MHD) objects with a large value of the
Lundquist number.
