用正则表达式从URL中抽取主机名

 

 

String url = " http://fhqiwcw.iteye.com/admin/blogs/1450540/edit ";
        String regexp = "((http[s]?)?(://))?([^/]*)(/?.*)";
        
        //方法1
        System.out.println(url.replaceAll(regexp, "$4"));
        
        //方法2
        Pattern p = Pattern.compile(regexp);
        Matcher m = p.matcher(url);
        if(m.matches()){
            System.out.println(m.group(4));
        }

        运行结果: fhqiwcw.iteye.com