Java正则多字符串匹配替换

public static void main(String[] args) { 
    //被替换关键字的的数据源 
    Map<String,String> tokens = new HashMap<String,String>(); 
    tokens.put("cat", "Garfield"); 
    tokens.put("beverage", "coffee"); 

    //匹配类似velocity规则的字符串 
    String template = "${cat} really needs some ${beverage}."; 
    //生成匹配模式的正则表达式 
    String patternString = "\$\{(" + StringUtils.join(tokens.keySet(), "|") + ")\}"; 

    Pattern pattern = Pattern.compile(patternString); 
    Matcher matcher = pattern.matcher(template); 

    //两个方法：appendReplacement, appendTail 
    StringBuffer sb = new StringBuffer(); 
    while(matcher.find()) { 
        matcher.appendReplacement(sb, tokens.get(matcher.group(1))); 
    } 
    matcher.appendTail(sb); 

    //out: Garfield really needs some coffee. 
    System.out.println(sb.toString()); 

    //对于特殊含义字符"","$"，使用Matcher.quoteReplacement消除特殊意义 
    matcher.reset(); 
    //out: cat really needs some beverage. 
    System.out.println(matcher.replaceAll("$1")); 
    //out: $1 really needs some $1. 
    System.out.println(matcher.replaceAll(Matcher.quoteReplacement("$1"))); 

    //到得邮箱的前缀名。插一句，其实验证邮箱的正则多种多样，根据自己的需求写对应的正则才是王道 
    String emailPattern = "^([a-z0-9_\.\-\+]+)@([\da-z\.\-]+)\.([a-z\.]{2,6})$"; 
    pattern = Pattern.compile(emailPattern); 
    matcher = pattern.matcher("test@qq.com"); 
    //验证是否邮箱 
    System.out.println(matcher.find()); 
    //得到@符号前的邮箱名  out: test 
    System.out.println(matcher.replaceAll("$1")); 

    //获得匹配值 
    String temp = "<meta-data android:name="appid" android:value="joy"></meta-data>"; 
    pattern = Pattern.compile("android:(name|value)="(.+?)""); 
    matcher = pattern.matcher(temp); 
    while(matcher.find()) { 
        //out: appid, joy 
        System.out.println(matcher.group(2)); 
    } 
}