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using System.Text.RegularExpressions;
string str = "请对您的言行负责,并遵守|abc|有关法律法规,尊重网上道德。谢谢您来|aBC|下CSDN网站";
string pattern = "|abc|";
string replacement = "中国";
string newString = Regex.Replace(str, pattern, replacement, RegexOptions.IgnoreCase);
Response.Write(newString);
string s = "请对您的言行负责,并遵守|abc|有关法律法规,尊重网上道德。谢谢您来|aBC|下CSDN网站";
string r = Regex.Replace(s, @"(?is)\|abc\|", "中国");
Response.Write(r);