Find and replace a character in a string in Go




String manipulation functions are a must have for a programming language and Go has plenty of them. In this tutorial we will see how to find and replace characters in a string.

strings.Replace() function will take in 4 parameters.

  1. First is the input string.
  2. Second is characters or words to find
  3. Third is the new replacement
  4. Fourth is the number ( n ) of instances found and to be replaced.

If n < 0, there is no limit on the number of replacements.

To find and replace white spaces from a string

 str := " This string has many spaces that need to be replaced "
 fmt.Println(strings.Replace(str, " ", "", -1))

because we want to remove unlimited instances of spaces in the string. We will use -1 as the fourth parameter. You can use -20 or -5 if you want. Remember the rule :

If n < 0, there is no limit on the number of replacements.

The above code output will be :

Thisstringhasmanyspacesthatneedtobereplaced

Full example code :

 package main

 import (
 "fmt"
 "strings"
 )

 func main() {
 str := " This string has many many spaces that need to be replaced "

 fmt.Println(strings.Replace(str, " ", "", -1))


 str2 := " This string has much much spaces that need to be replaced "

 fmt.Println(strings.Replace(str2, "much", "many", 2))
 }

output :

Thisstringhasmanymanyspacesthatneedtobereplaced

This string has many many spaces that need to be replaced

Reference :

http://golang.org/pkg/strings/#Replace

  See also : Golang :Trim white spaces from a string





By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


Advertisement