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C#如何使用正则表达式检测是不是合法的URL等

发布:2021/7/15 15:18:59作者:管理员 来源:本站 浏览次数:1144

public class RegexUtil
    {
        private RegexUtil() { }

        private static RegexUtil instance = null;
        /// <summary>
        /// 静态实例化单体模式
        /// 保证应用程序操作某一全局对象,让其保持一致而产生的对象
        /// </summary>
        /// <returns></returns>
        public static RegexUtil GetInstance()
        {
            if (RegexUtil.instance == null)
            {
                RegexUtil.instance = new RegexUtil();
            }
            return RegexUtil.instance;
        }

        /// <summary>
        /// 判断输入的字符串只包含汉字
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsChineseCh(string input)
        {
            return IsMatch(@"^[\u4e00-\u9fa5]+$", input);
        }

        /// <summary>
        /// 匹配3位或4位区号的电话号码,其中区号可以用小括号括起来,
        /// 也可以不用,区号与本地号间可以用连字号或空格间隔,
        /// 也可以没有间隔
        /// \(0\d{2}\)[- ]?\d{8}|0\d{2}[- ]?\d{8}|\(0\d{3}\)[- ]?\d{7}|0\d{3}[- ]?\d{7}
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsPhone(string input)
        {
            string pattern = "^\\(0\\d{2}\\)[- ]?\\d{8}$|^0\\d{2}[- ]?\\d{8}$|^\\(0\\d{3}\\)[- ]?\\d{7}$|^0\\d{3}[- ]?\\d{7}$";
            return IsMatch(pattern, input);
        }

        /// <summary>
        /// 判断输入的字符串是否是一个合法的手机号
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsMobilePhone(string input)
        {
            return IsMatch(@"^13\\d{9}$", input);
        }

        /// <summary>
        /// 判断输入的字符串只包含数字
        /// 可以匹配整数和浮点数
        /// ^-?\d+$|^(-?\d+)(\.\d+)?$
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsNumber(string input)
        {
            string pattern = "^-?\\d+$|^(-?\\d+)(\\.\\d+)?$";
            return IsMatch(pattern, input);
        }

        /// <summary>
        /// 匹配非负整数
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsNotNagtive(string input)
        {
            return IsMatch(@"^\d+$", input);
        }
        /// <summary>
        /// 匹配正整数
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsUint(string input)
        {
            return IsMatch(@"^[0-9]*[1-9][0-9]*$", input);
        }

        /// <summary>
        /// 判断输入的字符串字包含英文字母
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsEnglisCh(string input)
        {
            return IsMatch(@"^[A-Za-z]+$", input);
        }

        /// <summary>
        /// 判断输入的字符串是否是一个合法的Email地址
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsEmail(string input)
        {
            string pattern = @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
            return IsMatch(pattern, input);
        }

        /// <summary>
        /// 判断输入的字符串是否只包含数字和英文字母
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsNumAndEnCh(string input)
        {
            return IsMatch(@"^[A-Za-z0-9]+$", input);
        }

        /// <summary>
        /// 判断输入的字符串是否是一个超链接
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsURL(string input)
        {
            string pattern = @"^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$";
            return IsMatch(pattern, input);
        }

        /// <summary>
        /// 判断输入的字符串是否是表示一个IP地址
        /// </summary>
        /// <param name="input">被比较的字符串</param>
        /// <returns>是IP地址则为True</returns>
        public static bool IsIPv4(string input)
        {
            string[] IPs = input.Split('.');

            for (int i = 0; i < IPs.Length; i++)
            {
                if (!IsMatch(@"^\d+$", IPs[i]))
                {
                    return false;
                }
                if (Convert.ToUInt16(IPs[i]) > 255)
                {
                    return false;
                }
            }
            return true;
        }

        /// <summary>
        /// 判断输入的字符串是否是合法的IPV6 地址
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsIPV6(string input)
        {
            string pattern = "";
            string temp = input;
            string[] strs = temp.Split(':');
            if (strs.Length > 8)
            {
                return false;
            }
            int count = RegexUtil.GetStringCount(input, "::");
            if (count > 1)
            {
                return false;
            }
            else if (count == 0)
            {
                pattern = @"^([\da-f]{1,4}:){7}[\da-f]{1,4}$";
                return IsMatch(pattern, input);
            }
            else
            {
                pattern = @"^([\da-f]{1,4}:){0,5}::([\da-f]{1,4}:){0,5}[\da-f]{1,4}$";
                return IsMatch(pattern, input);
            }
        }

        #region 正则的通用方法
        /// <summary>
        /// 计算字符串的字符长度,一个汉字字符将被计算为两个字符
        /// </summary>
        /// <param name="input">需要计算的字符串</param>
        /// <returns>返回字符串的长度</returns>
        public static int GetCount(string input)
        {
            return Regex.Replace(input, @"[\u4e00-\u9fa5/g]", "aa").Length;
        }

        /// <summary>
        /// 调用Regex中IsMatch函数实现一般的正则表达式匹配
        /// </summary>
        /// <param name="pattern">要匹配的正则表达式模式。</param>
        /// <param name="input">要搜索匹配项的字符串</param>
        /// <returns>如果正则表达式找到匹配项,则为 true;否则,为 false。</returns>
        public static bool IsMatch(string pattern, string input)
        {
            if (input == null || input == "") return false;
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>
        /// 从输入字符串中的第一个字符开始,用替换字符串替换指定的正则表达式模式的所有匹配项。
        /// </summary>
        /// <param name="pattern">模式字符串</param>
        /// <param name="input">输入字符串</param>
        /// <param name="replacement">用于替换的字符串</param>
        /// <returns>返回被替换后的结果</returns>
        public static string Replace(string pattern, string input, string replacement)
        {
            Regex regex = new Regex(pattern);
            return regex.Replace(input, replacement);
        }

        /// <summary>
        /// 在由正则表达式模式定义的位置拆分输入字符串。
        /// </summary>
        /// <param name="pattern">模式字符串</param>
        /// <param name="input">输入字符串</param>
        /// <returns></returns>
        public static string[] Split(string pattern, string input)
        {
            Regex regex = new Regex(pattern);
            return regex.Split(input);
        }

        /* *******************************************************************
         * 1、通过“:”来分割字符串看得到的字符串数组长度是否小于等于8
         * 2、判断输入的IPV6字符串中是否有“::”。
         * 3、如果没有“::”采用 ^([\da-f]{1,4}:){7}[\da-f]{1,4}$ 来判断
         * 4、如果有“::” ,判断"::"是否止出现一次
         * 5、如果出现一次以上 返回false
         * 6、^([\da-f]{1,4}:){0,5}::([\da-f]{1,4}:){0,5}[\da-f]{1,4}$
         * ******************************************************************/
        /// <summary>
        /// 判断字符串compare 在 input字符串中出现的次数
        /// </summary>
        /// <param name="input">源字符串</param>
        /// <param name="compare">用于比较的字符串</param>
        /// <returns>字符串compare 在 input字符串中出现的次数</returns>
        private static int GetStringCount(string input, string compare)
        {
            int index = input.IndexOf(compare);
            if (index != -1)
            {
                return 1 + GetStringCount(input.Substring(index + compare.Length), compare);
            }
            else
            {
                return 0;
            }

        }
        /// <summary>
        /// 检测串值是否为合法的网址格式
        /// </summary>
        /// <param name="strValue">要检测的String值</param>
        /// <returns>成功返回true 失败返回false</returns>
        public static bool CheckIsUrlFormat(string strValue)
        {
            return CheckIsFormat(@"^(http|https|ftp)\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&$%\$#\=~])*$", strValue);
        }

        /// <summary>
        /// 检测串值是否为合法的格式
        /// </summary>
        /// <param name="strRegex">正则表达式</param>
        /// <param name="strValue">要检测的String值</param>
        /// <returns>成功返回true 失败返回false</returns>
        public static bool CheckIsFormat(string strRegex, string strValue)
        {
            if (strValue != null && strValue.Trim() != "")
            {
                Regex re = new Regex(strRegex);
                if (re.IsMatch(strValue))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            return false;
        }

        #endregion
    }