Golang正则表达式无法匹配字节10

Question

Try the following:

func main(){
    r := regexp.MustCompile(`(.)`)
    for i := 0; i < 255; i++{
        d := []byte{byte(i)}
        all := r.FindAll(d, -1)
        fmt.Println(all)
    }
}

The wildcard cannot match byte 10 (ie the new line character). Looks like a bug. I suppose regex was never really meant to work with []byte, but golang offers the []byte functions, so this is kind of an oversight.

Answer 1

You need to tell it to match against new lines .. by specifying the s flag:

r := regexp.MustCompile(`(?s)(.)`)

Try it in the playground: http://play.golang.org/p/MK-UECa9AV

The s flag tells the parser to let . match a new line.