C#正则表达式提取字符串汉字部分

using System.Text.RegularExpressions;

public static string GetChineseWord( string oriText)
{
  string x = @"[\u4E00-\u9FFF]+" ;
  MatchCollection Matches = Regex.Matches
  (oriText, x, RegexOptions.IgnoreCase);
  StringBuilder sb = new StringBuilder();
  foreach (Match NextMatch in Matches)
  {
   sb.Append(NextMatch.Value);
  }
  return sb.ToString();
}

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