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分享string test = @"<span id=zoom class=""default_newtest7"">
<span id=""tt"">abc(来源:新华网,本站编辑)</span> ";
Regex reg = new Regex(@"(?<=<span[^>]*?id=""tt""[^>]*>)[^<>(]+");
Match m = reg.Match(test);
if (m.Success)
{
richTextBox2.Text += m.Value;
}string test = @"<span id=zoom class=""default_newtest7"">
<span id=""tt"">abc(来源:新华网,本站编辑)def</span>";
Regex reg = new Regex(@"(?<=<span[^>]*?id=""tt""[^>]*>)[^<>]+");
Regex regF = new Regex(@"([^)]*)");
Match m = reg.Match(test);
if (m.Success)
{
richTextBox2.Text += regF.Replace(m.Value, "");
}