Java正则表达式匹配URL中的host

public static String getHost(String url) {if (url == null || url.trim().equals("")) {return "";}String host = "";Pattern p = Pattern.compile("(?<=//|)((\\w)+\\.)+\\w+(:\\d*)?");Matcher matcher = p.matcher(url);if (matcher.find()) {host = matcher.group();}return host;}