//验证字符串切割函数Split()            string st = "abcd erfas dflkj      ";            char[] a = new char[] { ' ' };      //当引号内空一个space            string[] b = st.Split(a);            //string[] b = st.Split(new char[] { ' ' });             foreach (string i in b)            {                Console.WriteLine("{0}",i);            }            string words = "攻击距离10米,对目标造成50%的法术伤害,额外造成80%火元素伤害";            string[] split = words.Split(new char[] { ',' });  //以逗号分隔字符串            foreach (string s in split)            {                Console.WriteLine(s);            }            string st1 = "您2要验证的字符串1,]w！";            byte[] l = Encoding.UTF8.GetBytes(st1); //字节长度                        string str = System.Text.RegularExpressions.Regex.Replace(st, @"[^\w]|_", "");//替换掉所有的符号,如逗号，感叹号等             string[] x = System.Text.RegularExpressions.Regex.Split(str, @"\d");// 数字个数            string[] xx = System.Text.RegularExpressions.Regex.Split(str, @"[\u4e00-\u9fa5]"); //汉字的个数            string[] xxx = System.Text.RegularExpressions.Regex.Split(str, @"[a-zA-Z]"); //字母的个数                    Console.WriteLine("字节长度:" + (l.Length - 1) + "\r\n 数字个数:" + (x.Length - 1) + "\r\n 汉字的个数:" + (xx.Length - 1) + "\r\n 字母的个数:" + (xxx.Length - 1));            Console.WriteLine(str); string str1 = "[dfasd][afasdf][adfaf]";            Console.WriteLine(Regex.Matches(str1, "]").Count);  //匹配特定字符个数，如计算"]"的个数为3个

using System.Text.RegularExpressions;

 

判断字符串里含有非数字元素

string input_num = "11w13";      //方法一，使用正则表达            if (Regex.IsMatch(input_num, "^((\\+|-)\\d)?\\d*$"))      {         Console.WriteLine("all is number!");      }      else      {         Console.WriteLine("number & other charactor!");      }      //方法二，用char的IsNumber            for (int i = 0; i < input_num.Length; i++)      {         if (char.IsNumber(input_num[i]))         {             Console.WriteLine("shuzi");         }         else         {             Console.WriteLine("feizhuzi");         }      }