C#中如何應用正則表達式判別字符。本站提示廣大學習愛好者:(C#中如何應用正則表達式判別字符)文章只能為提供參考,不一定能成為您想要的結果。以下是C#中如何應用正則表達式判別字符正文
廢話不多說了,上面代碼給大家引見下應用正則表達式判別字符的辦法,詳細代碼如下所示:
using System; using System.Text.RegularExpressions; using System.NET; namespace 正則表達式檢測字符串 { class Program { static void Main(string[] args) { Console.WriteLine("請輸出字符串:"); string s = Console.ReadLine(); if (GF_IsOk.IsExistHanZi(s)) { Console.Write("包括漢字"); } else { Console.Write("不包括漢字"); } Console.ReadLine(); } } //判別局部 public class GF_IsOk { /// <summary> /// 判讀能否是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> /// 判別能否是數字 /// </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> /// 判別能否是日期字符串 /// </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> /// 判別能否是日期字符串 /// </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) { // 假如解析辦法失敗則表示不是日期性數據 bValid = false; } return bValid; } /// <summary> /// 判別字符串中能否包括漢字,有前往true 否則為false /// </summary> /// <param name="str"></param> /// <returns></returns> public static bool IsExistHanZi(string str) { Regex reg = new Regex(@"[\u4e00-\u9fa5]");//正則表達式 if (reg.IsMatch(str)) { return true; } else { return false; } } /// <summary> /// 字段串能否為Null或為""(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> /// 前往文件能否存在 /// </summary> /// <param name="filename">文件名</param> /// <returns>能否存在</returns> public static bool IsFileExists(string filename) { return System.IO.File.Exists(filename); } /// <summary> /// 檢測能否契合email格式 /// </summary> /// <param name="strEmail">要判別的email字符串</param> /// <returns>判別後果</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, @"^@(( [0−9]1,3\.[0−9]1,3\.[0−9]1,3\.)|(([\w−]+\.)+))([a−zA−Z]2,4|[0−9]1,3)( ?)$"); } /// <summary> /// 檢測能否是正確的Url /// </summary> /// <param name="strUrl">要驗證的Url</param> /// <returns>判別後果</returns> public static bool IsURL(string strUrl) { return Regex.IsMatch(strUrl, @"^(http|https)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{1,10}))(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\?\'\\\+&%\$#\=~_\-]+))*$"); } /// <summary> /// 判別能否為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> /// 檢測能否有Sql風險字符 /// </summary> /// <param name="str">要判別字符串</param> /// <returns>判別後果</returns> public static bool IsSafeSqlString(string str) { return !Regex.IsMatch(str, @"[-|;|,|\/||| | |\}|\{|%|@|\*|!|\']"); } } }
以上所述是給大家引見的C#中如何應用正則表達式判別字符,希望對大家有所協助,假如大家有任何疑問請給我留言,會及時回復大家的。在此也十分感激大家對網站的支持!