请教高手,正则表达式替换为什么在出错？

将String中
{ban,2000000345,468,60,ban}替换成200000034546860 public static void main(String[] args) {

 String regexBan="\\{ban,([0-9]+),([0-9]+),([0-9]+),ban\\}";
 String emailContent ="test banner " +
 "banner :{ban,2000000276,728,90,ban} banner 2 :{ban,3000000344,728,90,ban} " +
 "banner 3:{ban,2000000345,468,60,ban} banner 4:{ban,3000000369,120,600,ban} ";

 String matchRegex= ".*" + regexBan + ".*" ;
 Pattern p = Pattern.compile(matchRegex,Pattern.DOTALL );


 int cnt = 0;
 while(true){
 Matcher match = p.matcher(emailContent);
 System.out.println("matches:"+match.matches());
 if(match.matches()){
 cnt++;
 String Id=match.replaceFirst("$1");
 String width=match.replaceFirst("$2");
 String height=match.replaceFirst("$3");
 System.out.println("para:"+Id+":"+width+":"+height);
 emailContent=emailContent.replaceFirst(regexBan,Id + width + height);
 System.out.println("email content:" + emailContent );

 }else break;
 }
}结果：
matches:true
para:3000000369:120:600
email content:test banner banner :3000000369120600 banner 2 :{ban,3000000344,728,90,ban} banner 3:{ban,2000000345,468,60,ban} banner 4:{ban,3000000369,120,600,ban} 
matches:true
para:3000000369:120:600
email content:test banner banner :3000000369120600 banner 2 :3000000369120600 banner 3:{ban,2000000345,468,60,ban} banner 4:{ban,3000000369,120,600,ban} 
matches:true
para:3000000369:120:600
email content:test banner banner :3000000369120600 banner 2 :3000000369120600 banner 3:3000000369120600 banner 4:{ban,3000000369,120,600,ban} 
matches:true
para:3000000369:120:600
email content:test banner banner :3000000369120600 banner 2 :3000000369120600 banner 3:3000000369120600 banner 4:3000000369120600 
matches:false

解决方案 »

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把String matchRegex= ".*" + regexBan + ".*" ;
改为String matchRegex= ".*?" + regexBan + ".*" ;代码好怪异，为什么要这么做呢？
直接这样不就可以了吗
emailContent=emailContent.replaceAll(regexBan, "$1$2$3");
System.out.println(emailContent);