  We compute the next-to-leading order (NLO) QCD corrections to the $1 \to 2$
splitting amplitudes in different dimensional regularization (DREG) schemes.
Besides recovering previously known results, we explore new DREG schemes and
analyze their consistency by comparing the divergent structure with the
expected behavior predicted by Catani's formula. Through the introduction of
scalar-gluons, we show the relation among splittings matrices computed using
different schemes. Also, we extended this analysis to cover the double
collinear limit of scattering amplitudes in the context of QCD+QED.
