using System;

using System.Text.RegularExpressions; using System.Net;

namespace 正则表达式检测字符串

{     class Program     {         static void Main(string[] args)         {                          Console.WriteLine("请输入字符串：");             string s = Console.ReadLine();             if (GF_IsOk.IsExistHanZi(s))             {                 Console.Write("包含汉字");             }             else             {                 Console.Write("不包含汉字");             }             Console.ReadLine();         }     }     //判断部分     public class GF_IsOk     {         /// <summary>         /// 判读是否是IP地址         /// </summary>         /// <param name="in_str"></param>         /// <returns></returns>         public static bool IsIPStr(string in_str)         {             IPAddress ip;             return IPAddress.TryParse(in_str, out ip);         }

        /// <summary>

        /// 判断是否是数字         /// </summary>         /// <param name="strNumber"></param>         /// <returns></returns>         public static bool IsNumber(string strNumber)         {

            Regex objNotNumberPattern = new Regex("[^0-9.-]");

            Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");             Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");             String strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$";             String strValidIntegerPattern = "^([-]|[0-9])[0-9]*$";             Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");             return !objNotNumberPattern.IsMatch(strNumber) &&                    !objTwoDotPattern.IsMatch(strNumber) &&                    !objTwoMinusPattern.IsMatch(strNumber) &&                    objNumberPattern.IsMatch(strNumber);         }

        /// <summary>

        ///  判断是否是日期字符串         /// </summary>         /// <param name="in_str"></param>         /// <returns></returns>         public static bool IsDateStr_yyyymmdd(string in_str)         {             if (in_str == "") return true;             if (in_str.Length != 8) return false;             return IsDateStr(in_str);         }

        /// <summary>

        /// 判断是否是日期字符串         /// </summary>         /// <param name="in_str"></param>         /// <returns></returns>         public static bool IsDateStr(string in_str)         {             if (in_str == "") return true;             if (in_str.Length == 8)                 in_str = in_str.Substring(0, 4) + "-" + in_str.Substring(4, 2) + "-" + in_str.Substring(6, 2);             DateTime dtDate;             bool bValid = true;             try             {                 dtDate = DateTime.Parse(in_str);             }             catch (FormatException)             {                 // 如果解析方法失败则表示不是日期性数据                 bValid = false;             }             return bValid;         }

        /// <summary>

        /// 判断字符串中是否包含汉字,有返回true 否则为false         /// </summary>         /// <param name="str"></param>         /// <returns></returns>         public static bool IsExistHanZi(string str)         {             Regex reg = new Regex(@"[\u4e00-\u9fa5]");//正则表达式             if (reg.IsMatch(str))             {                 return true;             }             else             {                 return false;             }         }

        /// <summary>         /// 字段串是否为Null或为""(空)         /// </summary>         /// <param name="str"></param>         /// <returns></returns>         public static bool IsStrNullOrEmpty(string str)         {             if (str == null || str.Trim() == string.Empty)                 return true;

            return false;

        }

        /// <summary>

        /// 返回文件是否存在         /// </summary>         /// <param name="filename">文件名</param>         /// <returns>是否存在</returns>         public static bool IsFileExists(string filename)         {             return System.IO.File.Exists(filename);         }

        /// <summary>         /// 检测是否符合email格式         /// </summary>         /// <param name="strEmail">要判断的email字符串</param>         /// <returns>判断结果</returns>         public static bool IsValidEmail(string strEmail)         {             return Regex.IsMatch(strEmail, @"^[\w\.]+([-]\w+)*@[A-Za-z0-9-_]+[\.][A-Za-z0-9-_]");         }

        public static bool IsValidDoEmail(string strEmail)

        {             return Regex.IsMatch(strEmail, @"");         }         /// <summary>         /// 检测是否是正确的Url         /// </summary>         /// <param name="strUrl">要验证的Url</param>         /// <returns>判断结果</returns>         public static bool IsURL(string strUrl)         {             return Regex.IsMatch(strUrl, @"^(http|https)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{1,10}))(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\?\'\\\+&%\$#\=~_\-]+))*$");         }

        /// <summary>

        /// 判断是否为base64字符串         /// </summary>         /// <param name="str"></param>         /// <returns></returns>         public static bool IsBase64String(string str)         {             //A-Z, a-z, 0-9, +, /, =             return Regex.IsMatch(str, @"[A-Za-z0-9\+\/\=]");         }

        /// <summary>

        /// 检测是否有Sql危险字符         /// </summary>         /// <param name="str">要判断字符串</param>         /// <returns>判断结果</returns>         public static bool IsSafeSqlString(string str)         {             return !Regex.IsMatch(str, @"[-|;|,|\/|\(|\)|\[|\]|\}|\{|%|@|\*|!|\']");         }     } }

本文转自蓬莱仙羽51CTO博客，原文链接：http://blog.51cto.com/dingxiaowei/1366618，如需转载请自行联系原作者