In this paper, as a further generalization of fuzzy ideals, we introduce the notion of a fuzzy (soft) quasi-interior ideals of semirings and characterize regular semiring in terms of fuzzy (soft) quasi-interior ideals of semirings. We prove that (μ,A) is a fuzzy soft left quasi-interior ideal over a regular semiring M, if and only if (μ,A) is a fuzzy soft quasi-ideal over a semiring M, and study some of the properties