长字符串,怎么只替换括号外部的逗号而不替换括号内部的逗号

Question

怎么只替换括号外部的逗号不替换括号内部的逗号,如把这个字符串的括号外的逗号替换成"HHH":a(12,as)b,213s,sdf(re,sdfsd(sd,323))
替换结果:a(12,as)bHHH213sHHHsdf(re,sdfsd(sd,323))

Answer 1

正则表达式
Regex.Replace();具体怎么写，LX来。

Answer 2

string str = "a(12,as)b,213s,sdf(re,sdfsd(sd,323))";                str = Regex.Replace(str, @"(?<=\G[^(),]+?(\((?>[^()]+|\((?<Open>)|\)(?<-Open>))*(?(Open)(?!))\))?[^(),]*),", "HHH");//
                //a(12,as)bHHH213sHHHsdf(re,sdfsd(sd,323))