codePointCount

import kotlin.test.*
import java.util.*
import java.util.regex.*

fun main() { 
   //sampleStart 
   val str = "abc"
// The string contains three code points: 97, 98 and 99
println(str.codePointCount(0, 3).toString()) // 3
// There are two code points in between characters with code points 1 (inclusive) and 3 (exclusive)
println(str.codePointCount(1, 3).toString()) // 2
// There are no code points for an empty range
println(str.codePointCount(2, 2).toString()) // 0
// The begin index cannot exceed the end index
// str.codePointCount(3, 2) // will fail with IndexOutOfBoundsException
// Indices cannot be negative
// str.codePointCount(-1, 2) // will fail with IndexOutOfBoundsException
// The end index cannot exceed the length of the string
// str.codePointCount(0, str.length + 1) // will fail with IndexOutOfBoundsException

val broccoli = "🥦"
// 🥦 has a code point value 0x1F966, and it is represented as a UTF-16 surrogate pair 0xD83E, 0xDD66
// The surrogate pair is counted as a single code point
println(broccoli.codePointCount(0, broccoli.length /* = 2 */)) // 1
// The high-surrogate char is counted as a single code point as well
println(broccoli.codePointCount(0, broccoli.length - 1 /* = 1 */)) // 1 
   //sampleEnd
}