Kotlin replace function in String class

	fun main(args: Array<String>) {
	/* Replace
	* 1, a substring
	* 2, Regular Expression (Regex)
	* 3, Replace Character
	* 4, Replace First*/
	/**** Substring Replace ***/
	val st = "Hello World"
	val nst = st.replace("World", "Kotlin")
	println(st)
	println(nst)
	/**** Regular Expression ***/
	val str = "abc2342dc234"
	var newStr = str.replace(Regex("\\d+"),
	"X")
	/**** Replace character ***/
	var newStrr = str.replace("a",
	"X")
	println(str)
	println(newStr)
	println(newStrr)
	/**** ReplaceFirst ***/
	val a = "Hello guys Hello World"
	val b = st.replace("Hello", "Hi", true)
	println(a)
	println(b)
	}

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