Kotlin:计算字符串中字符串的出现次数

Question

val string = "5 kg rice 2 kg wheat 3 kg Soya"

是否有高阶函数统计上述字符串中的String "kg"？

Answer 1

fun main() {
    val s = "5 kg rice 2 kg wheat 3 kg Soya"
    val c = "\\bkg\\b".toRegex().findAll(s).count()
    println(c)
}