如何优化下面功能?

实现自增功能,00001两边有值。 123aaaaa00001_a 123aaaaa00002_a 123aaaaa00003_a

str:="123aaaaa00001_a"

var valid = regexp.MustCompile("[0-9]*[0-9]")

a0 := valid.FindAllString(str, -1)

a1 := valid.FindAllStringIndex(str, -1)

start := fmt.Sprintf(str[:a1[len(a0)-1][0]])

end := fmt.Sprintf(str[a1[len(a0)-1][1]:])

ss, _ := strconv.ParseInt(a0[len(a0)-1], 10, 64)

x:=[5]int{1,2,3,4,5}

for k, _ := range x{ sss := fmt.Sprintf("%0*d", len(a0[len(a0)-1]), ss+int64(k)) fmt.Println( start + sss + end)
}