replace a substring in a string in go

To replace all occurrences of a substring within a string in Go, you can use the strings.Replace() function. It takes four arguments:

The original string
The substring to be replaced
The replacement string
The number of replacements to make (-1 for all)

Here's an example:


main.go
package main

import (
    "fmt"
    "strings"
)

func main() {
    original := "the quick brown fox jumps over the lazy dog"
    replaced := strings.Replace(original, "dog", "cat", -1)
    fmt.Println(replaced)
}
214 chars
13 lines

This will output:


main.go
the quick brown fox jumps over the lazy cat
44 chars
2 lines

Note that the Replace() function returns a new string with the replacements made - it does not modify the original string. If you want to modify the original string, you can do something like:


main.go
package main

import (
    "fmt"
    "strings"
)

func main() {
    original := "the quick brown fox jumps over the lazy dog"
    modified := []rune(original)
    modified = []rune(strings.Replace(string(modified), "dog", "cat", -1))
    fmt.Println(string(modified))
}
270 chars
14 lines

This will output:


main.go
the quick brown fox jumps over the lazy cat
44 chars
2 lines

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