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Let $a$ be a non-invertible transformation of a finite set and let $G$ be agroup of permutations on that same set. Then $\genset{G, a}\setminus G$ is asubsemigroup, consisting of all non-invertible transformations, in thesemigroup generated by $G$ and $a$. Likewise, the conjugates $a^g=g^{-1}ag$ of$a$ by elements $g\in G$ generate a semigroup denoted $\genset{a^g | g\in G}$.We classify the finite permutation groups $G$ on a finite set $X$ such that thesemigroups $\genset{G,a}$, $\genset{G, a}\setminus G$, and $\genset{a^g | g\inG}$ are regular for all transformations of $X$. We also classify thepermutation groups $G$ on a finite set $X$ such that the semigroups $\genset{G,a}\setminus G$ and $\genset{a^g | g\in G}$ are generated by their idempotentsfor all non-invertible transformations of $X$.

Groups that together with any transformation generate regular semigroups or idempotent generated semigroups