Question

How to replace the last occurrence of a substring in a string with Kotlin

Answer 1

object ReplaceLastOccurrence {
    fun replaceLastOccurrence(s: String, oldsub: String, newsub: String): String {
        val lastIndex = s.lastIndexOf(oldsub)
        
        return if (lastIndex == -1) {
            s
        } else {
            s.substring(0, lastIndex) + newsub + s.substring(lastIndex + oldsub.length)
        }
    }

    @JvmStatic
    fun main(args: Array<String>) {
        val s = "Kotlin programming cross-platform general-purpose programming"
        
        val oldsub = "programming"
        val newsub = "ABC"
        
        val result = replaceLastOccurrence(s, oldsub, newsub)
        
        println(result)
    }
}
 

 
/*
run:

Kotlin programming cross-platform general-purpose ABC
 
*/

 

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