import java.util.*

fun transformation(input: String, findRegex: String, replaceRegex: String): String =
    input.replace("""\D+""".toRegex(), "").replace(findRegex.toRegex(), {
    	it.groupValues[1].toString() + 
    	  (if (!it.groupValues[2].isNullOrEmpty()) ".${it.groupValues[2].toString()}"  else "") + 
    	  (if (!it.groupValues[3].isNullOrEmpty()) ".${it.groupValues[3].toString()}"  else "") + 
    	  (if (!it.groupValues[4].isNullOrEmpty()) "-${it.groupValues[4].toString()}"  else "")
    })
 
fun main(args: Array<String>) {
    val input = "0112121234" // 011.212.123-4
    // val input = "011" //  011
    // val input = "01121212" // 011.212.12
    // val input = "011212" // 011.212
    // val input = "01121" //  011.21
    // val input = "0112" //  011.2
    val findRegex = """^(\d{3})(\d{1,3})?(\d{1,3})?(\d{1,2})?$"""
    val replaceRegex = """$1.$2.$3-$4"""
    val result = transformation(input, findRegex, replaceRegex)
    println(result)
}