C# 正则表达式类 Match类和Group类
C#正则表达式类 Match类和Group类<div class="postbody"><div id="cnblogs_post_body">Match类
示例：查找出字符串中包含的url
string text = "FirstUrl: http://www.sohu.com ,SecondUrl: http://www.baidu.com ";
string pattern = @"\b(\S+)://(\S+)\b";//匹配URL的模式
MatchCollection mc = Regex.Matches(text, pattern); //满足pattern的匹配集合
Console.WriteLine("文本中包含的URL地址有：");
foreach (Match match in mc)
{
Console.WriteLine(match.Value);
}
Console.ReadLine();
结果：
http://images.cnitblog.com/blog/424537/201212/18171844-d796edafeed64ed086ba122c6c9e2c81.jpg
Group类
示例：找到字符串中包含的url，并找出每个url的协议和域名地址
string text = "FirstUrl: http://www.sohu.com ,SecondUrl: http://www.baidu.com ";
string pattern = @"\b(?<protocol>\S+)://(?<address>\S+)\b"; //匹配URL的模式,并分组
MatchCollection mc = Regex.Matches(text, pattern); //满足pattern的匹配集合
Console.WriteLine("文本中包含的URL地址有：");
foreach (Match match in mc)
{
GroupCollection gc = match.Groups;
string outputText = "URL:" + match.Value + "；Protocol:" + gc["protocol"].Value + "；Address:" + gc["address"].Value;
Console.WriteLine(outputText);
}
Console.Read();
http://images.cnitblog.com/blog/424537/201212/18173801-d193784e296745f3af5b48a74aa4ae0a.jpg
说明："?<protocol>"和"?<address>"定义了每个组的别名protocol和address
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