kotlin 指定文字列の出現数をカウント

gistfile1.txt

// 指定文字列の出現数をカウント
fun main(args: Array<String>) { 
    var hashmap = mutableMapOf<String, String>()
    hashmap["aaa"] = "WWDDDWWDDDDLWDDDD"
    hashmap["bbb"] = "WWDDDWWDDDDLWDDDD"

    var dcount = mutableMapOf<String, Int>()
    for((key, value) in hashmap) { 
        println(key)
        println(value)
        var str: String = value
        var findstrlist = listOf("DDDDD", "DDDD", "DDD")
        for(findstr: String in findstrlist) {
            var len1 = str.length
            str = str.replace(findstr, "")
            var len2 = str.length
            var count = (len1 - len2) / findstr.length
            println("$findstr, $count")
            if (dcount[findstr] == null) {
                dcount[findstr] = count
            } else {
                dcount[findstr] = dcount[findstr]!! + count
            }
        }
    }
    println(dcount)
}