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string aa = "大发放阿发13912731231大大法国客户131大幅13131阿发";
aa = Regex.Replace(aa, @"(?<=[^\d]+\d{4})(\d+)(?=[^\d])", m => new string('*', m.Result("$1").Length));
Console.WriteLine(aa);
string aa = "大发放阿发13912731231大大法国客户131大幅13131阿发";
aa = Regex.Replace(aa, @"(\d{4})(\d+)", m => m.Result("$1") + new string('*', m.Result("$2").Length));
void Main()
{
string s="大发放阿发13912731231大大法国客户131大幅13131阿发";
foreach(Match m in Regex.Matches(s,@"\d{4,}"))
{
Console.WriteLine(m.Value .Length >4?m.Value.Substring(0,4)+new string('*',m.Value.Length -4):m.Value);
}
/*
1391*******
1313*
*/
}