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//hovertreeConsole.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}))$");Console.WriteLine(b);#endregion#region 匹配email的regex//hovertreeConsole.WriteLine("请输入Email地址");string email = Console.ReadLine();bool bhvt = Regex.IsMatch(email, @"^\w+@\w+\.\w+$");Console.WriteLine(bhvt);#endregion#region 匹配ip地址的regex//hovertreeConsole.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"//hovertreeConsole.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。