Sample kotlin code of substringBeforeLast()

kotlin substringBeforeLast

    private const val MY_EMAIL = "ajay@[email protected]"
    fun main() {
        val username = MY_EMAIL.substringBeforeLast(delimiter = '@', missingDelimiterValue = "Username not found")
        println("Username -> $username")
    }
    // Output
    Username -> ajay@deepak07
    
    Explanation: that’s not a valid email address but this is only for example. 
    The moment substringBeforeLast method finds the first @ delimiter from the right 
    side even though the MY_EMAIL has two @ delimiters. It’ll return the remaining left 
    side substring without going further.