extract digit numbers from string in kotlin

i want to extract numbers from string
how can i do that in Kotlin ?

81aabf9d-844e-4086-9621-f3afed02e163

to

81984440869621302163

>Solution :

just use this extension function

fun String?.extractDigit(): Long {
    if (this == null) {
        return 0
    }
    var nums = this.replace("\\D+".toRegex(), "")
    Log.i("extractDigit", nums)

    if (nums.isEmpty())
        return 0

    return nums.toLong()
}