Kotlin:
부분 문자열 추출

fun main() {
    val fullString = "안녕하세요, 여러분"
    val extracted = fullString.substring(4, 9)
    
    println(extracted) // 출력: 세요, 
}

fun getRangeFromText(startText: String, endText: String, fullText: String): String? {
    val startIndex = fullText.indexOf(startText) + startText.length
    val endIndex = fullText.indexOf(endText, startIndex)
    
    return if (startIndex > 0 && endIndex > 0) fullText.substring(startIndex, endIndex) else null
}

fun main() {
    val startText = "안녕"
    val endText = "분"
    val fullText = "안녕하세요, 여러분"
    val result = getRangeFromText(startText, endText, fullText)
    
    println(result) // 출력: 하세요, 여러
}