详解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;

一、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();

二、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

 三、C#正则表达式Regex常用匹配

#region SFZ号码正则表达式      //何问起              Console.WriteLine("请输入一个SFZ号码");        string id = Console.ReadLine();        bool b4 = Regex.IsMatch(id, @"^\d{15}|\d{18}$");        bool b5 = Regex.IsMatch(id, @"^(\d{15}|\d{18})$");        Console.WriteLine(b4);        Console.WriteLine(b5);            #endregion
      #region 匹配电话号码      //hovertree      
        Console.WriteLine("请输入电话号码");        string phone = Console.ReadLine();        bool b = Regex.IsMatch(phone, @"^((\d{3,4}\-\d?{7,8})|(\d{5}))$");        Console.WriteLine(b);            #endregion
      #region 匹配email的regex
      //hovertree              Console.WriteLine("请输入Email地址");        string email = Console.ReadLine();        bool bhvt = Regex.IsMatch(email, @"^\w+@\w+\.\w+$");        Console.WriteLine(bhvt);            #endregion
      #region 匹配ip地址的regex      //hovertree              Console.WriteLine("请输入一个IP地址");        string ip = Console.ReadLine();        bool bkly = Regex.IsMatch(ip, @"^\d{1,3}(\.\d{1,3}){3}$");        Console.WriteLine(bkly);            #endregion
      #region 匹配日期合法regex      //何问起              Console.WriteLine("请输入一个日期");        string date = Console.ReadLine();        bool bhovertree = Regex.IsMatch(date, @"^\d{4}\-\d{1,2}\-\d{1,2}$");        Console.WriteLine(bhovertree);            #endregion

      #region 匹配url地址的regex      //"http://hovertree.com"      //"http://keleyi.com/a/bjae/h1o76nuh.htm?id=3&name=aaa"      //"https://s.taobao.com/search?q=hover+tree&js=1&stats_click=search_radio_all%3A1&initiative_id=staobaoz_20151204&ie=utf8"      //"ftp://127.0.0.1/myslider.txt"
      //hovertree              Console.WriteLine("请输入url地址");        string url = Console.ReadLine();        bool bkeleyi = Regex.IsMatch(url, @"^[a-zA-Z]+://.+$");        Console.WriteLine(bkeleyi);            #endregion

以上就是关于C#正则表达式Regex常用匹配的详细介绍,希望对大家的学习有所帮助。