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private string ReplaceStr(Match m)
{
return "<a href=xxxxxx>" + m.Value + "</a>";
}
private void button10_Click(object sender, EventArgs e)
{
StreamReader reader = new StreamReader("c:\\1.txt");
string source = reader.ReadToEnd();
Regex reg = new Regex(@"(?<!((<a[^>].*?)|(<span[^>].*?)))茶叶");
source = reg.Replace(source, ReplaceStr);
MessageBox.Show(source);
}