问 [img]xxx[/img]改为<img scr="xxx"> 正则表达式如何写

问 [img]xxx[/img]改为<img scr="xxx"> 正则表达式怎么写
将  
  [img]xxxx[/img]改为
<img   scr= "xxxx ">
的正式表达怎么写,   谢谢解答!

[解决办法]
string str = @ "[img]xxxx[/img] ";
string r = @ "\[[/]?img\] ";
str = @ " <img scr= " " "+System.Text.RegularExpressions.Regex.Match(str, r).ToString()+@ " " "> ";

[解决办法]
try

string yourStr = ..............;
string resultStr = Regex.Replace(yourStr, @ "\[img\]([^\[]*?)\[/img\] ", @ " <img src= " "$1 " " border= " "0 " "> ", RegexOptions.IgnoreCase);