Sample of kotlin code substringAfterLast()

Kotlin substringAfterLast

    private const val FILE_PATH = "/storage/emulated/0/DCIM/Gallery/.2394823usfdfh234uu9sd2333.mp4"
    fun main() {
        val fileExtension = FILE_PATH.substringAfterLast(delimiter = ".", missingDelimiterValue = "Extension Not found")
        println("File extension -> $fileExtension")
    }
    // Output
    File extension -> mp4
    
    Explanation: the substringAfterLast method successfully gives the file extension 
    although the FILE_PATH contains two delimiter value well, that’s because the method 
    starts searching from the right-side of source string.