C#正则表达式获取下拉菜单(select)的相关属性值

//取html中全部<select>项的值
Regex reg_select = new Regex("(?is)<select name=*.*?>]*.*?</select>");

//取html中一个 select name 等于"Status"的值
Regex status = new Regex(@"(?is)<select name=""status"">]*.*?</select>");

//取html中一个下拉菜单 select name 等于"Status"的中值
Regex status = new Regex(@"(?is)<select name=""status"">]*.*?</select>");
MatchCollection mc_status = status.Matches(strDoc);
getSelectOptions(mc_status,cmbStatus);

/// <summary>
/// 取select对列表复制
/// </summary>
/// <param name="selected"></param>
/// <param name="cmb"></param>
void getSelectOptions(MatchCollection selected,ComboBox cmb)
{
    if (selected.Count < 1)
        return;
    txtValues.Text = "";
    txtValues.Text = selected[0].Value.Replace("</option>",Environment.NewLine);
    string tmpTxt = "";
    foreach (string s in txtValues.Lines)
    {
        if (s == "")
            continue;
        string a = "";
        a = s.Replace(""","").Replace("<option value="","");
        int x = a.LastIndexOf(">");
        tmpTxt += a.Substring(x + 1) + Environment.NewLine;
    }
    txtValues.Text = tmpTxt.Trim();
    cmb.Items.Clear();
    cmb.Items.AddRange(txtValues.Lines);
    cmb.SelectedIndex = 0;
    cmb.Size = cmb.PreferredSize;
}