java正则匹配正则表达式

1、简单匹配小案例

public static void main( String[] args ){

        // 按指定模式在字符串查找
        String line = "This order was placed for QT3000! OK? This is OK.";
        String pattern = "(OK)\\?";

        // 创建 Pattern 对象
        Pattern r = Pattern.compile(pattern);

        // 现在创建 matcher 对象
        Matcher m = r.matcher(line);

         List<String> slist = new ArrayList<String>();

        while (m.find()) {
            System.out.println("Found value: " + m.group());
            slist.add(m.group());
        }

        System.out.println(slist);
    }