sample use of substringBefore method

kotlin substringBefore

    private const val EMAIL = "[email protected]"
    fun main() {
       val username = MY_EMAIL.substringBefore(delimiter = "@", missingDelimiterValue = "Usernmae Not Found")
       println("Username -> $username")
    }
    // Output
    Username -> ajaydeepak07

  Explanation: the above program returns the substring before the appearance of @ character.