How to remove redundant spaces/whitespace from a string in Golang?

Question

I was wondering how to remove:

• All leading/trailing whitespace or new-line characters, null characters, etc.
• Any redundant spaces within

Answer 1

Use regexp for this.

func main() {
    data := []byte("   Hello,   World !   ")
    re := regexp.MustCompile("  +")
    replaced := re.ReplaceAll(bytes.TrimSpace(data), []byte(" "))
    fmt.Println(string(replaced))
    // Hello, World !
}

In order to also trim newlines and null characters, you can use the bytes.Trim(src []byte, cutset string) function instead of bytes.TrimSpace