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[ASP.net教程]C#正则表达式Regex常用匹配


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/urlcode/

 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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