C# 正则表达式类 Match类和Group类

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：



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();



说明："?<protocol>"和"?<address>"定义了每个组的别名protocol和address