从字符串中找到中文

   private void btnSearchChinese_Click(object sender, EventArgs e)
        {
            string originalStr=originalTxt.Text;
            string result = "";
            Regex regex = new Regex("([\u4e00-\u9fa5]+)"); 
            for (int i = 0; i < originalStr.Length; i++)
            {
                if (regex.IsMatch(originalStr[i].ToString()))
                {
                    result += originalStr[i].ToString();
                }
            }
            resultTxt.Text = result;

        }

winform程序写的