求一个JAVA正则

Question

哎，对正则不通用途：替换参数如输入:      key1=value1  key2=value2
  调用：replace("key1","newvalue1");
  输出:   key1=newvalue1 key2=value2用例1：key2=value2  key1=value1
  调用：replace("key1","newvalue1");
  输出:   key2=value2 key1=newvalue1 
用例2：key2=value2  key3=value3
  调用：replace("key1","newvalue1");
  输出:   key2=value2 key3=value3 实现：
String text;
String replace(String key,String newValue){
//TODO:text.replaceAll(........);}

Answer 1

已解决：
"%s[\\s]*=[\\s]*(\\w)*(\\s|$)"

Answer 2

修正一下："%s[\\s]*=[\\s]*(\\w*)(\\s|$)"

Answer 3

var reg=/(\w+)=(\w+)/g;
var a="key1=value1 key2=value2 key3=value3";
var a=a.replace(reg,'$1=new$2 ');
alert(a);
js的话这样试试  你看看能不能转成java的