汉字提取(C#)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

 

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "fdsa汉jklfda字ljklfdsa提jkflds取ljfjkds";
            string newstr = "";
            Regex rg = new Regex(@"[\u4e00-\u9fa5]");
            for (int ii = 0; ii < str.Length; ii++)
            {
                string val = str.Substring(ii, 1);
                if (rg.IsMatch(val))
                {
                    newstr += val;
                }
            }
            Console.WriteLine(newstr);
            Console.Read();
        }
    }
}