截取前十个字符

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

namespace TESTDEMO
{
    class Program
    {
        static void Main(string[] args)
        {
            string characters = "惺惺相惜";
            Console.WriteLine(SubStringTen(characters));
            Console.Read();
        }
        /// <summary>
        /// 截取前十个字符
        /// </summary>
        /// <param name="characters"></param>
        /// <returns></returns>
        static string SubStringTen(string characters)
        {
            MatchCollection matches = Regex.Matches(characters, ".");
            int length = matches.Count > 10 ? 10 : matches.Count;
            StringBuilder str = new StringBuilder();
            for (int i = 0; i < length; i++)
            {
                str.Append(matches[i].Value);
            }
            return str.ToString();
        }
    }
}