正则表达式成对括号匹配问题

[JeasonZhao]

字符串
A=(a1= (a2=v2) (a3=v3) (a4=(a5=v5)) (a6=v6))B=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))C=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))D=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))EB=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))

分析Oracle的TNS定义，我要取得 B=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))
C#下使用
Regex r = new Regex("(\\)|\\s)*B\\s*=\\s*(\\(.*\\))?\\s*\\)",RegexOptions.IgnoreCase);
取得的是
))B=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))C=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))D=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))EB=(b1= (b2=v2) (b3=v3) (b4=(b5=v5)) (b6=v6))
怎么作啊，高手帮忙

[速马]

http://blog.sunmast.com/sunmast/archive/2005/01/27/1235.aspx