Go - String Replacement

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The strings package of Golang has a Replace() function which we can use to replace some characters in a string with a new value. It replaces only a specified "n" occurrences of the substring.

In addition to Replace(), there is a ReplaceAll() function that replaces all the occurrences of a given substring with a new value.

Syntax

 func Replace(s, old, new string, n int) string

Where,

• s is the given string

• old is the string which we want to replace

• new is the string which will replace the old string

• n represents the number of characters which we want to replace in the given string.

String Replacement Example 1

The following example demonstrates how you can use the Replace() function to replace a substring with a new string.

 package main import ( "fmt" "strings" ) func main() { // Initializing the Strings s := "Go Programming Language" old := "Go" newstring := "Golang" n := 1 // Display the Strings fmt.Println("Original String: ", s) // Using the Replace Function testresult := strings.Replace(s, old, newstring, n) // Display the Replace Output fmt.Println("Replace Go with Golang:", testresult) } 

Output

It will generate the following output −

 Original String: Go Programming Language Replace Go with Golang: Golang Programming Language 

String Replacement Example 2

In this example, we are going to see how to replace a single character with a new value at a particular defined postion or index.

 package main import ( "fmt" "strings" ) func main() { // Initializing the Strings x := "Replace String Function" y := "Go Language" // Display the Strings fmt.Println("1st String:", x) fmt.Println("2nd String:", y) // Using the Replace Function test1 := strings.Replace(x, "i", "I", 2) test2 := strings.Replace(y, "g", "G", -1) // Display the Replace Output fmt.Println("\n Replace 'i' with 'I' in the 1st String: \n", test1) fmt.Println("\n Replace 'g' with 'G' in the 2nd String: \n", test2) } 

Output

It will generate the following output −

 1st String: Replace String Function 2nd String: Go Language Replace 'i' with 'I' in the 1st String: Replace StrIng FunctIon Replace 'g' with 'G' in the 2nd String: Go LanGuaGe