Split string by repeatable delimiter in Java/Kotlin

Question

I am splitting a string by a repeatable delimiter, and am also intended to keep the delimiters as well.

val str = "xxoooooooxxoxoxooooo"
val reg = Regex("(?<=x+)|(?=x+)")
var list = str.split(reg)
println(list) 

The output is [, x, x, ooooooo, x, x, o, x, o, x, ooooo], though I would like to get

[xx, ooooooo, xx, o, x, o, x, ooooo]

Answer 1

val str = "xxoooooooxxoxoxooooo"
val reg =  Regex("o+|x+").findAll(str).map { it.value }.toList()
println(reg)
//[xx, ooooooo, xx, o, x, o, x, ooooo]