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
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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();
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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
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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();
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使用Regex类进行替换
示例1:简单情况
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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();
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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
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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>" ;
}
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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/
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#region 身份证号码正则表达式
//何问起
Console.WriteLine( "请输入一个身份证号码" );
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"
Console.WriteLine( "请输入url地址" );
string url = Console.ReadLine();
bool bkeleyi = Regex.IsMatch(url, @"^[a-zA-Z]+://.+$" );
Console.WriteLine(bkeleyi);
#endregion
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