Convert preg_match pattern to javascript pattern

Any one can help converting this php regex pattern to js compatible one?

$delimiter = "-";
$phone = "some number from the client";
var_dump(
    preg_match($phone,"|^([0-9]{1,3}".$delimiter."[0-9]{1,4}".$delimiter."[0-9]{4,12}(#[0-9]{1,4})开发者_如何学Go?)$|")
);

Thanks

---

var delimiter = "-",
    phone = "8-989-895",
    re = new RegExp("^[0-9]{1,3}"+delimiter+"[0-9]{1,4}"+delimiter+"[0-9]{4,12}(?:[0-9]{1,4})?$");
console.log(re.test(phone));