//String separator = System.getProperty("line.separator"); 
String separator = "\n"; //不知道LZ是否按行分割的，
                             //如果不是按行分割，用separator=""，也能对应，就是结果只有1行

String s = "@article{AcharyaBI93," + "\n" +
"author = \"Acharya, A. and Badrinath, B.R. and Imielinski, T.\"," + separator + 
"title = \"Impact of Mobility on Distributed Computations\"," + separator +
"journal = OSR," + separator +
"volume = 27," + separator +
"number = 2," + separator +
"pages = \"15-20\"," + separator +
"month = \"April\"," + separator +
"year = 1993" + separator +
"}";

System.out.println("----------original----------");
System.out.println(s);


s = s.replaceAll("^@article(.*)", "@Article$1").replaceAll("\"(.*?)\"", "{$1}");
StringBuffer buf = new StringBuffer();
Pattern p = Pattern.compile("((?<=("+separator+"[}],|,|))[^,]*?)(\\s*=\\s*.*?("+separator+"|[}],|,))");
Matcher m = p.matcher(s);
while (m.find()) {
    String s1 = m.group(1);
    System.out.println(m.group(1));
    m.appendReplacement(buf, m.group(1).toUpperCase()+"$3");
}
m.appendTail(buf);

System.out.println("----------after replace----------");
System.out.println(buf);