Check this out:http://www.scriptspot.com/3ds-max/scripts/heuristic-edge-select It selects edges based on angles and other parameters, thus also working on triangulated geometry.
Not sure what exactly you need it for but there is a tool in 3Dsmax in the Ribbon called quadrify. Selecte Editable_Poly, open Ribbon -> Modeling -> Geometry (All) DropDown -> Quadrify All (And some Other options that let you select what it thinks are all triangular edgeloops)