用户注册信息验证类库

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

namespace MyHelper4Web
{
    /// <summary>
    /// 常用验证操作类
    /// </summary>
    public class MyValidateHelper
    {
        #region Public Fields

        private static readonly Regex RegNumber = new Regex("^[0-9]+$");

        private static readonly Regex RegNumberSign = new Regex("^[+-]?[0-9]+$");

        private static readonly Regex RegDecimal = new Regex("^[0-9]+[.]?[0-9]+$");

        private static readonly Regex RegDecimalSign = new Regex("^[+-]?[0-9]+[.]?[0-9]+$"); //等价于^[+-]?\d+[.]?\d+$

        private static readonly Regex RegEmail = new Regex(@"^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$");

        //w 英文字母或数字的字符串，和 [a-zA-Z0-9] 语法一样 

        private static readonly Regex RegCHZN = new Regex("[\u4e00-\u9fa5]");

        #endregion

        #region 用户名密码格式

        /// <summary>
        /// 返回字符串真实长度, 1个汉字长度为2
        /// </summary>
        /// <param name="stringValue">字符串</param>
        /// <returns>字符长度</returns>
        public static int GetStringLength(string stringValue)
        {
            return Encoding.Default.GetBytes(stringValue).Length;
        }

        /// <summary>
        /// 检测用户名格式是否有效
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <returns>返回值</returns>
        public static bool IsValidUserName(string userName)
        {
            int userNameLength = GetStringLength(userName);
            if (userNameLength >= 4 && userNameLength <= 20 &&
                Regex.IsMatch(userName, @"^([\u4e00-\u9fa5A-Za-z_0-9]{0,})$"))
            {
                // 判断用户名的长度（4-20个字符）及内容（只能是汉字、字母、下划线、数字）是否合法
                return true;
            }
            return false;
        }

        /// <summary>
        /// 密码有效性
        /// </summary>
        /// <param name="password">密码</param>
        /// <returns>返回值</returns>
        public static bool IsValidPassword(string password)
        {
            return Regex.IsMatch(password, @"^[A-Za-z_0-9]{6,16}$");
        }

        #endregion

        #region 数字字符串检查

        /// <summary>
        /// int有效性
        /// </summary>
        /// <param name="val">字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidInt(string val)
        {
            return Regex.IsMatch(val, @"^[1-9]\d*\.?[0]*$");
        }

        /// <summary>
        /// 是否数字字符串
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsNumber(string inputData)
        {
            Match m = RegNumber.Match(inputData);
            return m.Success;
        }

        /// <summary>
        /// 是否数字字符串 可带正负号
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsNumberSign(string inputData)
        {
            Match m = RegNumberSign.Match(inputData);
            return m.Success;
        }

        /// <summary>
        /// 是否是浮点数
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsDecimal(string inputData)
        {
            Match m = RegDecimal.Match(inputData);
            return m.Success;
        }

        /// <summary>
        /// 是否是浮点数 可带正负号
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsDecimalSign(string inputData)
        {
            Match m = RegDecimalSign.Match(inputData);
            return m.Success;
        }

        #endregion

        #region 中文检测

        /// <summary>
        /// 检测是否有中文字符
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsHasCHZN(string inputData)
        {
            Match m = RegCHZN.Match(inputData);
            return m.Success;
        }

        /// <summary> 
        /// 检测含有中文字符串的实际长度 
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static int GetCHZNLength(string inputData)
        {
            var n = new ASCIIEncoding();
            byte[] bytes = n.GetBytes(inputData);

            int length = 0; // l 为字符串之实际长度 
            for (int i = 0; i <= bytes.Length - 1; i++)
            {
                if (bytes[i] == 63) //判断是否为汉字或全脚符号 
                {
                    length++;
                }
                length++;
            }
            return length;
        }

        #endregion

        #region 常用格式

        /// <summary>
        /// 验证身份证是否合法  15 和  18位两种
        /// </summary>
        /// <param name="idCard">要验证的身份证</param>
        /// <returns>返回值</returns>
        public static bool IsIdCard(string idCard)
        {
            if (string.IsNullOrEmpty(idCard))
            {
                return false;
            }

            if (idCard.Length == 15)
            {
                return Regex.IsMatch(idCard, @"^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$");
            }
            if (idCard.Length == 18)
            {
                return Regex.IsMatch(idCard,
                                     @"^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])((\d{4})|\d{3}[A-Z])$",
                                     RegexOptions.IgnoreCase);
            }
            return false;
        }

        /// <summary>
        /// 是否是邮件地址
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsEmail(string inputData)
        {
            Match m = RegEmail.Match(inputData);
            return m.Success;
        }

        /// <summary>
        /// 邮编有效性
        /// </summary>
        /// <param name="zip">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidZip(string zip)
        {
            var rx = new Regex(@"^\d{6}$", RegexOptions.None);
            Match m = rx.Match(zip);
            return m.Success;
        }

        /// <summary>
        /// 固定电话有效性
        /// </summary>
        /// <param name="phone">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidPhone(string phone)
        {
            var rx = new Regex(@"^(\(\d{3,4}\)|\d{3,4}-)?\d{7,8}$", RegexOptions.None);
            Match m = rx.Match(phone);
            return m.Success;
        }

        /// <summary>
        /// 手机有效性
        /// </summary>
        /// <param name="mobile">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidMobile(string mobile)
        {
            var rx = new Regex(@"^(13|15)\d{9}$", RegexOptions.None);
            Match m = rx.Match(mobile);
            return m.Success;
        }

        /// <summary>
        /// 电话有效性（固话和手机 ）
        /// </summary>
        /// <param name="number">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidPhoneAndMobile(string number)
        {
            var rx = new Regex(@"^(\(\d{3,4}\)|\d{3,4}-)?\d{7,8}$|^(13|15)\d{9}$", RegexOptions.None);
            Match m = rx.Match(number);
            return m.Success;
        }

        /// <summary>
        /// Url有效性
        /// </summary>
        /// <param name="url">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidURL(string url)
        {
            return Regex.IsMatch(url,
                                 @"^(http|https|ftp)\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&%\$#\=~])*[^\.\,\)\(\s]$");
        }

        /// <summary>
        /// IP有效性
        /// </summary>
        /// <param name="ip">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsValidIP(string ip)
        {
            return Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");
        }

        /// <summary>
        /// domain 有效性
        /// </summary>
        /// <param name="host">域名</param>
        /// <returns>返回值</returns>
        public static bool IsValidDomain(string host)
        {
            var r = new Regex(@"^\d+$");
            if (host.IndexOf(".") == -1)
            {
                return false;
            }
            return !r.IsMatch(host.Replace(".", string.Empty));
        }

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

        /// <summary>
        /// 验证字符串是否是GUID
        /// </summary>
        /// <param name="guid">字符串</param>
        /// <returns>返回值</returns>
        public static bool IsGuid(string guid)
        {
            if (string.IsNullOrEmpty(guid))
                return false;

            return Regex.IsMatch(guid, "[A-F0-9]{8}(-[A-F0-9]{4}){3}-[A-F0-9]{12}|[A-F0-9]{32}", RegexOptions.IgnoreCase);
        }

        #endregion

        #region 日期检查

        /// <summary>
        /// 判断输入的字符是否为日期
        /// </summary>
        /// <param name="strValue">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsDate(string strValue)
        {
            return Regex.IsMatch(strValue,
                                 @"^((\d{2}(([02468][048])|([13579][26]))[\-\/\s]?((((0?[13578])|(1[02]))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]?((0?[1-9])|([1-2][0-9])))))|(\d{2}(([02468][1235679])|([13579][01345789]))[\-\/\s]?((((0?[13578])|(1[02]))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))");
        }

        /// <summary>
        /// 判断输入的字符是否为日期,如2004-07-12 14:25|||1900-01-01 00:00|||9999-12-31 23:59
        /// </summary>
        /// <param name="strValue">输入字符串</param>
        /// <returns>返回值</returns>
        public static bool IsDateHourMinute(string strValue)
        {
            return Regex.IsMatch(strValue,
                                 @"^(19[0-9]{2}|[2-9][0-9]{3})-((0(1|3|5|7|8)|10|12)-(0[1-9]|1[0-9]|2[0-9]|3[0-1])|(0(4|6|9)|11)-(0[1-9]|1[0-9]|2[0-9]|30)|(02)-(0[1-9]|1[0-9]|2[0-9]))\x20(0[0-9]|1[0-9]|2[0-3])(:[0-5][0-9]){1}$");
        }

        #endregion

        #region 其他

        /// <summary>
        /// 检查字符串最大长度，返回指定长度的串
        /// </summary>
        /// <param name="inputData">输入字符串</param>
        /// <param name="maxLength">最大长度</param>
        /// <returns>返回值</returns>
        public static string CheckMathLength(string inputData, int maxLength)
        {
            if (!string.IsNullOrEmpty(inputData))
            {
                inputData = inputData.Trim();
                if (inputData.Length > maxLength) //按最大长度截取字符串
                {
                    inputData = inputData.Substring(0, maxLength);
                }
            }
            return inputData;
        }

        /// <summary>
        /// 转换成 HTML code
        /// </summary>
        /// <param name="str">输入字符串</param>
        /// <returns>返回值</returns>
        public static string Encode(string str)
        {
            str = str.Replace("&", "&amp;");
            str = str.Replace("'", "''");
            str = str.Replace("\"", "&quot;");
            str = str.Replace(" ", "&nbsp;");
            str = str.Replace("<", "&lt;");
            str = str.Replace(">", "&gt;");
            str = str.Replace("\n", "<br>");
            return str;
        }

        /// <summary>
        ///解析html成 普通文本
        /// </summary>
        /// <param name="str">输入字符串</param>
        /// <returns>返回值</returns>
        public static string Decode(string str)
        {
            str = str.Replace("<br>", "\n");
            str = str.Replace("&gt;", ">");
            str = str.Replace("&lt;", "<");
            str = str.Replace("&nbsp;", " ");
            str = str.Replace("&quot;", "\"");
            return str;
        }

        #endregion
    }
}