String str1 = "address :is \"From\" \"dummy@dummyxyz.com\", address :is \"From\" \"emilychewpccw@gmail.com\"";

        String regEx = ".\"From\"\\s\""; //这个需要各位大虾帮忙修改的地方

        Pattern pattern = Pattern.compile(regEx);
        Matcher mather = pattern.matcher(str1);

        boolean flag = mather.matches();

        while (mather.find()) {
            // System.out.println( mather.group() );
        }

        String[] strs = str1.split(regEx);
        for (String s : strs) {
            System.out.println(s);
            
        }

        String str1 = "address :is \"From\" \"dummy@dummyxyz.com\", address :is \"From\" \"emilychewpccw@gmail.com\"";

        String regEx = "[\\w]*@[\\w]*.com"; //这个需要各位大虾帮忙修改的地方
        

        Pattern pattern = Pattern.compile(regEx);
        Matcher mather = pattern.matcher(str1);

        boolean flag = mather.matches();

        while (mather.find()) {
             System.out.println( mather.group() );
        }

//        String[] strs = str1.split(regEx);
//        for (String s : strs) {
//            System.out.println(s);
            
//        }

------解决方案--------------------
用楼上的方法好些。如果按照楼主的思路来需要匹配的字符有
address :is \"From\" \"
\", address :is \"From\" \"
\"
很难匹配啊

------解决方案--------------------
重复造轮子不如网上搜搜来的快

------解决方案--------------------

String str1 = "address :is \"From\" \"dummy@dummyxyz.com\", address :is \"From\" \"emilychewpccw@gmail.com\"";

       String regEx = "address :is \"From\""; //这个需要各位大虾帮忙修改的地方

       Pattern pattern = Pattern.compile(regEx);
       Matcher mather = pattern.matcher(str1);

       boolean flag = mather.matches();

       while (mather.find()) {
           // System.out.println( mather.group() );
       }

       String[] strs = str1.split(regEx);
       for (String s : strs) {
           System.out.println(s);
          
       }


------解决方案--------------------
在网上搜一下好了