asp.net 怎么提取一个字符串中的所有中国字

Question

比如说string str="adasdasdasdas天天>>"@#@!#!@天";
我想吧 '天天天' 提取出来 当然不一定是'天天天'这两个字 只是举个例子 也不知道中国字的确切位置 
咋提取中国字呢 

Answer 1

http://www.cnblogs.com/alronzhang/archive/2010/02/14/1668316.html

Answer 2

正则啊    string x = @"[\u4E00-\u9FFF]+";
    string str="adasdasdasdas天天>>"@#@!#!@天";
    MatchCollection Matches = Regex.Matches(str, x, RegexOptions.IgnoreCase);
    StringBuilder sb = new StringBuilder();
    foreach (Match NextMatch in Matches)
    {
        sb.Append(NextMatch.Value);
    }
    return sb.ToString();

Answer 3

static void Main(string[] args)
            {
                string str="adasdasdasdas天天>>天";
                StringBuilder sb = new StringBuilder();
                Regex re = new Regex("[\\u4e00-\\u9fa5]+", RegexOptions.None);
                MatchCollection mc = re.Matches(str);
                foreach (Match ma in mc)
                {
                    sb.Append(ma.Value);
                }
                Console.WriteLine(sb.ToString()); 
                Console.ReadLine();
                
                
            }

Answer 4

"[\\u4e00-\\u9fa5]+这一串是中文字符的编码范围么

Answer 5

static void Main(string[] args)
            {
                string str="我心依然是中国心xoxo";
                StringBuilder sb = new StringBuilder();
                Regex re = new Regex("[\\u4e00-\\u9fa5]+", RegexOptions.None);
                MatchCollection mc = re.Matches(str);
                foreach (Match ma in mc)
                {
                    sb.Append(ma.Value);
                }
                Console.WriteLine(sb.ToString()); 
                Console.ReadLine();
                
                
            }