  Let $E$ be a locally convex space, $U\subseteq\mathbb{R}^n$ as well as
$V\subseteq\mathbb{R}^m$ be open and
$k,l\in\mathbb{N}_0\cup\left\{\infty\right\}$. Locally convex spaces
$C^{k,l}(U\times V,E)$ of functions with different degrees of differentiability
in the $U$- and $V$-variable were recently studied by H.Alzaareer, who
established an exponential law of the form $C^{k,l}(U\times V,E)\cong
C^k(U,C^l(V,E))$. We establish an analogous exponential law
$C^{k,l}_{\mathcal{W}_1\otimes\mathcal{W}_2}(U\times V,E)\cong
C^k_{\mathcal{W}_1}(U,C^l_{\mathcal{W}_2}(V,E))$ for suitable spaces of
weighted $C^{k,l}$-maps, as well as an analogue for spaces of weighted
continuous functions on locally compact spaces. The results entail that certain
Lie groups $C^l_\mathcal{W}(U,H)$ of weighted mappings introduced by B.Walter
are $C^k$-regular, for each $C^k$-regular Lie group $H$ modeled on a locally
convex space and a suitable set of weights $\mathcal{W}$.
