java正则表达式分析替换字符串

java正则表达式分析替换字符串

博客分类：
• j2se

java

public static void main(String[] args){

        String regex = "\\$\\{(.+?)\\}";
        String str = "<a onclick=\"showUserName('${session.user.username}','${session.user.password}');\" >linkme</a>" ;
        Pattern pattern = Pattern.compile(regex);
        System.out.println(pattern);
        Matcher matcher = pattern.matcher(str);
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            System.out.println(">>>>> replace sequence : " + matcher.group(0));
            System.out.println(">>>>> index range : (" + matcher.start() + ", " + matcher.end() + ")");
            System.out.println(">>>>> sub : " + str.substring(matcher.start(), matcher.end()));
            matcher.appendReplacement(sb, "123");
            System.out.println("-----------------");
        }
        matcher.appendTail(sb);
        System.out.println(">>>> sb : " + sb.toString());

    }

输出：

\$\{(.+?)\}
>>>>> replace sequence : ${session.user.username}
>>>>> index range : (26, 50)
>>>>> sub : ${session.user.username}
-----------------
>>>>> replace sequence : ${session.user.password}
>>>>> index range : (53, 77)
>>>>> sub : ${session.user.password}
-----------------
>>>> sb : <a onclick="showUserName('123','123');" >linkme</a>