进行正则表达式：匹配三个星号

Question

So I did this:

r, _ := regexp.Compile("* * *")
r2 := r.ReplaceAll(b, []byte("<hr>"))

and got:

panic: runtime error: invalid memory address or nil pointer dereference

So I figured I had to escape them:

r, _ := regexp.Compile("\* \* \*")

But got unknown escape secuence

I'm a Go Beginner. What am I doing wrong?

Answer 1

Adding to @VonC's answer, regexp aren't always the answer and are generally slower than using strings.*.

For a complex expression, sure regexp is awesome, however if you just want to match a string and replace it then, strings.Replacer is the way to go:

var asterisksReplacer = strings.NewReplacer(`* * *`, `<hr>`)

func main() {
    fmt.Println(asterisksReplacer.Replace(`xxx * * * yyy *-*-* zzz* * *`))
}

<kbd>playground</kbd>