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C#正则表达式Regex常用匹配

2020-03-16 21:00:21
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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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