使用Regex類需要引用命名空間:using System.Text.RegularExpressions;
利用Regex類實現驗證
示例1:注釋的代碼所起的作用是相同的,不過一個是靜態方法,一個是實例方法
var source = "劉備關羽張飛孫權何問起"; //Regex regex = new Regex("孫權"); //if (regex.IsMatch(source)) //{ // Console.WriteLine("字符串中包含有敏感詞:孫權!"); //} if (Regex.IsMatch(source, "孫權")) { Console.WriteLine("字符串中包含有敏感詞:孫權!"); } Console.ReadLine();
示例2:使用帶兩個參數的構造函數,第二個參數指示忽略大小寫,很常用
var source = "123abc345DEf"; Regex regex = new Regex("def",RegexOptions.IgnoreCase); if (regex.IsMatch(source)) { Console.WriteLine("字符串中包含有敏感詞:def!"); } Console.ReadLine();
使用Regex類進行替換
示例1:簡單情況
var source = "123abc456ABC789"; // 靜態方法 //var newSource=Regex.Replace(source,"abc","|",RegexOptions.IgnoreCase); // 實例方法 Regex regex = new Regex("abc", RegexOptions.IgnoreCase); var newSource = regex.Replace(source, "|"); Console.WriteLine("原字符串:"+source); Console.WriteLine("替換後的字符串:" + newSource); Console.ReadLine();
結果:
原字符串:123abc456ABC789
替換後的字符串:123|456|789
示例2:將匹配到的選項替換為html代碼,我們使用了MatchEvaluator委托
var source = "123abc456ABCD789"; Regex regex = new Regex("[A-Z]{3}", RegexOptions.IgnoreCase); var newSource = regex.Replace(source,new MatchEvaluator(OutPutMatch)); Console.WriteLine("原字符串:"+source); Console.WriteLine("替換後的字符串:" + newSource); Console.ReadLine(); //柔城 private static string OutPutMatch(Match match) { return "<b>" +match.Value+ "</b>"; }
輸出:
原字符串:123abc456ABCD789
替換後的字符串:123<b>abc</b>456<b>ABC</b>D789
C#正則表達式Regex常用匹配
在線測試:http://tool.hovertree.com/a/zz/
1 #region 身份證號碼正則表達式 2 //何問起 3 4 Console.WriteLine("請輸入一個身份證號碼"); 5 string id = Console.ReadLine(); 6 bool b4 = Regex.IsMatch(id, @"^\d{15}|\d{18}$"); 7 bool b5 = Regex.IsMatch(id, @"^(\d{15}|\d{18})$"); 8 Console.WriteLine(b4); 9 Console.WriteLine(b5); 10 11 #endregion 12 13 #region 匹配電話號碼 14 //hovertree 15 16 17 Console.WriteLine("請輸入電話號碼"); 18 string phone = Console.ReadLine(); 19 bool b = Regex.IsMatch(phone, @"^((\d{3,4}\-\d?{7,8})|(\d{5}))$"); 20 Console.WriteLine(b); 21 22 #endregion 23 24 #region 匹配email的regex 25 26 //hovertree 27 28 Console.WriteLine("請輸入Email地址"); 29 string email = Console.ReadLine(); 30 bool bhvt = Regex.IsMatch(email, @"^\w+@\w+\.\w+$"); 31 Console.WriteLine(bhvt); 32 33 #endregion 34 35 #region 匹配ip地址的regex 36 //hovertree 37 38 Console.WriteLine("請輸入一個IP地址"); 39 string ip = Console.ReadLine(); 40 bool bkly = Regex.IsMatch(ip, @"^\d{1,3}(\.\d{1,3}){3}$"); 41 Console.WriteLine(bkly); 42 43 #endregion 44 45 #region 匹配日期合法regex 46 //何問起 47 48 Console.WriteLine("請輸入一個日期"); 49 string date = Console.ReadLine(); 50 bool bhovertree = Regex.IsMatch(date, @"^\d{4}\-\d{1,2}\-\d{1,2}$"); 51 Console.WriteLine(bhovertree); 52 53 #endregion 54 55 56 #region 匹配url地址的regex 57 //"http://hovertree.com" 58 //"http://keleyi.com/a/bjae/h1o76nuh.htm?id=3&name=aaa" 59 //"https://s.taobao.com/search?q=hover+tree&js=1&stats_click=search_radio_all%3A1&initiative_id=staobaoz_20151204&ie=utf8" 60 //"ftp://127.0.0.1/myslider.txt" 61 62 //hovertree 63 64 Console.WriteLine("請輸入url地址"); 65 string url = Console.ReadLine(); 66 bool bkeleyi = Regex.IsMatch(url, @"^[a-zA-Z]+://.+$"); 67 Console.WriteLine(bkeleyi); 68 69 #endregion
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