使用Regex类需要引用命名空间：using System.Text.RegularExpressions;
利用Regex类实现验证
示例1：注释的代码所起的作用是相同的，不过一个是静态方法，一个是实例方法
var source = "刘备关羽张飞孙权何问起";//Regex regex = new Regex("孙权");//if (regex.IsMatch(source))//{// Console.WriteLine("字符串中包含有敏感词:孙权！");//}if (Regex.IsMatch(source, "孙权")) { Console.WriteLine("字符串中包含有敏感词:孙权！");}Console.ReadLine();
示例2：使用带两个参数的构造函数,第二个参数指示忽略大小写，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词:def！");} Console.ReadLine();
使用Regex类进行替换
示例1：简单情况
var source = "123abc456ABC789";// 静态方法//var newSource=Regex.Replace(source,"abc","|",RegexOptions.IgnoreCase);// 实例方法Regex regex = new Regex("abc", RegexOptions.IgnoreCase);var newSource = regex.Replace(source, "|");Console.WriteLine("原字符串："+source);Console.WriteLine("替换后的字符串：" + newSource);Console.ReadLine();
结果：
原字符串：123abc456ABC789
替换后的字符串：123|456|789
示例2：将匹配到的选项替换为html代码，我们使用了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("替换后的字符串：" + newSource);Console.ReadLine(); //柔城private static string OutPutMatch(Match match){ return "<b>" +match.Value+ "</b>";}
输出：
原字符串：123abc456ABCD789
替换后的字符串：123<b>abc</b>456<b>ABC</b>D789
C#正则表达式Regex常用匹配
在线测试：http://tool.hovertree.com/a/zz/
1 #region 身份证号码正则表达式 2 //何问起 3 4 Console.WriteLine("请输入一个身份证号码"); 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 #endregion12 13 #region 匹配电话号码14 //hovertree15 16 17 Console.WriteLine("请输入电话号码");18 string phone = Console.ReadLine();19 bool b = Regex.IsMatch(phone, @"^((\d{3,4}\-\d?{7,8})|(\d{5}))$");20 Console.WriteLine(b);21 22 #endregion23 24 #region 匹配email的regex25 26 //hovertree27 28 Console.WriteLine("请输入Email地址");29 string email = Console.ReadLine();30 bool bhvt = Regex.IsMatch(email, @"^\w+@\w+\.\w+$");31 Console.WriteLine(bhvt);32 33 #endregion34 35 #region 匹配ip地址的regex36 //hovertree37 38 Console.WriteLine("请输入一个IP地址");39 string ip = Console.ReadLine();40 bool bkly = Regex.IsMatch(ip, @"^\d{1,3}(\.\d{1,3}){3}$");41 Console.WriteLine(bkly);42 43 #endregion44 45 #region 匹配日期合法regex46 //何问起47 48 Console.WriteLine("请输入一个日期");49 string date = Console.ReadLine();50 bool bhovertree = Regex.IsMatch(date, @"^\d{4}\-\d{1,2}\-\d{1,2}$");51 Console.WriteLine(bhovertree);52 53 #endregion54 55 56 #region 匹配url地址的regex57 //"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 //hovertree63 64 Console.WriteLine("请输入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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