C#判断字符串
using System; using System.Text.RegularExpressions; namespace MetarCommonSupport { /// <summary> /// 通过Framwork类库中的Regex类实现了一些特殊功能数据检查 /// </summary> public class MetarnetRegex { private static MetarnetRegex instance = null; public static MetarnetRegex GetInstance() { if (MetarnetRegex.instance == null) { MetarnetRegex.instance = new MetarnetRegex(); } return MetarnetRegex.instance; } private MetarnetRegex() { } /// <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) { Regex regex = new Regex("^[\u4e00-\u9fa5]+$"); return regex.IsMatch(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}$|^0\\d{3}[- ]?\\d{7}$"; Regex regex = new Regex(pattern); return regex.IsMatch(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) { Regex regex = new Regex("^1\\d{10}$"); return regex.IsMatch(input); } /// <summary> /// 判断输入的字符串只包含数字 /// 可以匹配整数和浮点数 /// ^-?\d+$|^(-?\d+)(\.\d+)?$ /// </summary> /// <param name="input"></param> /// <returns></returns> public static bool IsNumber(string input) { string pattern = "^-?\\d+$|^(-?\\d+)(\\.\\d+)?$"; Regex regex = new Regex(pattern); return regex.IsMatch(input); } /// <summary> /// 匹配非负整数 /// /// </summary> /// <param name="input"></param> /// <returns></returns> public static bool IsNotNagtive(string input) { Regex regex = new Regex(@"^\d+$"); return regex.IsMatch(input); } /// <summary> /// 匹配正整数 /// </summary> /// <param name="input"></param> /// <returns></returns> public static bool IsUint(string input) { Regex regex = new Regex("^[0-9]*[1-9][0-9]*$"); return regex.IsMatch(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) { Regex regex = new Regex("^[A-Za-z]+$"); return regex.IsMatch(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-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"; Regex regex = new Regex(pattern); return regex.IsMatch(input); } /// <summary> /// 判断输入的字符串是否只包含数字和英文字母 /// </summary> /// <param name="input"></param> /// <returns></returns> public static bool IsNumAndEnCh(string input) { string pattern = @"^[A-Za-z0-9]+$"; Regex regex = new Regex(pattern); return regex.IsMatch(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 = @"http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?"; string pattern = @"^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$"; Regex regex = new Regex(pattern); return regex.IsMatch(input); } /// <summary> /// 判断输入的字符串是否是表示一个IP地址 /// </summary> /// <param name="input">被比较的字符串</param> /// <returns>是IP地址则为True</returns> public static bool IsIPv4(string input) { string[] IPs = input.Split('.'); Regex regex = new Regex(@"^\d+$"); for (int i = 0; i < IPs.Length; i++) { if (!regex.IsMatch(IPs[i])) { return false; } if (Convert.ToUInt16(IPs[i]) > 255) { return false; } } return true; } /// <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) { 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); } /// <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 = MetarnetRegex.GetStringCount(input, "::"); if (count > 1) { return false; } else if (count == 0) { pattern = @"^([\da-f]{1,4}:){7}[\da-f]{1,4}$"; Regex regex = new Regex(pattern); return regex.IsMatch(input); } else { pattern = @"^([\da-f]{1,4}:){0,5}::([\da-f]{1,4}:){0,5}[\da-f]{1,4}$"; Regex regex1 = new Regex(pattern); return regex1.IsMatch(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; } } } }
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