kotlin 中字符串replace操作

package 

import 
import .
import 

class kotlinStringActivity : AppCompatActivity() {
    private val stringreplace = "Kotlin is a very good programming language"
    override fun onCreate(savedInstanceState: Bundle?) {
        (savedInstanceState)
        setContentView(.activity_kotlin_string)
        // Kotlin is Y very good progrYmming lYnguYge
        ("kotlin 替换所有a 变为Y", ("a", "Y"))
        //Kotlin is a very good programming languaY
        ("kotlin 替换掉最后一个a后面所有的字段", ("a", "Y"))
        // Kotlin is aY
        ("kotlin 替换掉第一个a后面的所有字段", ("a", "Y"))
        // Ya very good programming language
        ("kotlin 替换掉第一个a前面的所有字段", ("a", "Y"))
        // Yage
        ("kotlin 替换掉最后一个a前面的所有字段", ("a", "Y"))
        // Kotlin is Y very good programming language
        ("kotlin 替换掉第一个字段变成Y", ("a", "Y"))
        // Kotlin is Y very good programming language
        ("kotlin 替换掉第一个字段变成Y", ("a1111"))
        //  K222222n is a very good programming language
        ("kotlin 替换下标到另一个下标之间的内容", (1, 5, "222222"))
        /**
         *
        fun (
        newIndent: String = "",
        marginPrefix: String = "|"
        ): String
        通过marginPrefix检测缩进，因为它修剪trimMargin并将其替换为newIndent。
         */
        ("kotlin 替换下标到另一个下标之间的内容", ("", "|"))
    }
}