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string[] src = new string[] { "aaaaISAXDEDDbcccddd", "bbbbbbbbISAXDEDDaaa", "ccccccccccccc" };
foreach (string s in src)
{
if (Regex.IsMatch(s, @"^(?:(?!ISAXDEDD)[\s\S])+$", RegexOptions.IgnoreCase))
richTextBox2.Text += s + "\n";
}