Golang : Read a text file and replace certain words




Problem :

You have a text file with some words that you need to replace with another word.

Solution :

Use the bytes.Replace() function. For example :

 package main

 import (
 "bytes"
 "fmt"
 "io/ioutil"
 "os"
 )

 func main() {

 input, err := ioutil.ReadFile("original.txt")
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 output := bytes.Replace(input, []byte("replaceme"), []byte("ok"), -1)

 if err = ioutil.WriteFile("modified.txt", output, 0666); err != nil {
 fmt.Println(err)
 os.Exit(1)
 }
 }

original.txt

 this is a text file that contains couple of replaceme words that need to be replaced.
 for example, a replaceme word in this line


 and another [replaceme] word in this line too

and after executing the above code

modified.txt

 this is a text file that contains couple of ok words that need to be replaced.
 for example, a ok word in this line


 and another [ok] word in this line too

  See also : Golang : Read file





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.


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