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Let $(\mathbb{X} , d, \mu )$ be a proper metric measure space and let $\Omega\subset \mathbb{X}$ be a bounded domain. For each $x\in \Omega$, we choose aradius $0< \varrho (x) \leq \mathrm{dist}(x, \partial \Omega ) $ and let $B_x$be the closed ball centered at $x$ with radius $\varrho (x)$. If $\alpha \in\mathbb{R}$, consider the following operator in $C( \overline{\Omega} )$, $$  \mathcal{T}_{\alpha}u(x)=\frac{\alpha}{2}\left(\sup_{B_x } u+\inf_{B_x }u\right)+(1-\alpha)\,\frac{1}{\mu(B_x)}\int_{B_x}\hspace{-0.1cm} u\ d\mu. $$Under appropriate assumptions on $\alpha$, $\mathbb{X}$, $\mu$ and the radiusfunction $\varrho$ we show that solutions $u\in C( \overline{\Omega} )$ of thefunctional equation $\mathcal{T}_{\alpha}u = u$ satisfy a local H\"{o}lder orLipschitz condition in $\Omega$. The motivation comes from the so called$p$-harmonious functions in euclidean domains.

A priori H\"older and Lipschitz regularity for generalized $p$-harmonious functions in metric measure spaces