asp.net 脏字典过滤问题 用正则表达式来过滤脏数据

DateTime t1 =DateTime.Now;
string str="213";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
str+="珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋珍惜水晶之恋";
ValidDirty vd=new ValidDirty() ;
Console.WriteLine(vd.ValidByReg(str)) ;
DateTime t2 =DateTime.Now;
TimeSpan ts=t2-t1;
Console.WriteLine(ts.TotalMilliseconds) ;
Console.Read() ;