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void Main()
{
string str="TTSN=;MACDEVICE=000000000000;NAGRAID=172584369715;PSN=00000000000000;USN=000000000000000;ESN=00000000000000;PUBKEY=991808B1;PKCRC=1B1E202C;HDCPKSV=0000000000000000;STATUS=PASS;DATE=20101208160724;STATION=0";
//string s=Regex.Match(str,@"(?i)(?<=NAGRAID=)\d+(?=;)").Value;
str=Regex.Replace(str,@"(?i)(?<=NAGRAID=)\d+(?=;)","**-**-**-**-**-**");
Console.WriteLine(str);
}
/*
TTSN=;MACDEVICE=000000000000;NAGRAID=**-**-**-**-**-**;PSN=00000000000000;USN=000000000000000;ESN=00000000000000;PUBKEY=991808B1;PKCRC=1B1E202C;HDCPKSV=0000000000000000;STATUS=PASS;DATE=20101208160724;STATION=0
*/