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Regex reg = new Regex(@"(?is)</?a\b.*?href=(['""]?)(?!(?:http://)?www\.abc\.com)[^'""\s>]+\1[^>]*>(?<text>(?:(?!</?a).)*)</a>");
string result = reg.Replace(yourStr, "");
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string ds = Regex.Replace(row["products_description"].ToString(),"<a (.*?)>","",RegexOptions.Compiled);
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