本文实例讲述了C#基于正则表达式抓取a标签链接和innerhtml的方法。分享给大家供大家参考，具体如下：
//读取网页html
string text = File.ReadAllText(Environment.CurrentDirectory + "//test.txt" , Encoding.GetEncoding( "gb2312" ));
string prttern = "<a(\\s+(href=\"(?<url>([^\"])*)\"|'([^'])*'|\\w+=\"(([^\"])*)\"|'([^'])*'))+>(?<text>(.*?))</a>" ;
var maths = Regex.Matches(text, prttern);
//抓取出来写入的文件
using (FileStream w = new FileStream(Environment.CurrentDirectory + "//wirter.txt" , FileMode.Create))
{
for ( int i = 0; i < maths.Count; i++)
{
byte [] bs = Encoding.UTF8.GetBytes( string .Format( "链接地址:{0}, innerhtml：{1}" , maths[i].Groups[ "url" ].Value,
maths[i].Groups[ "text" ].Value) + "\r\n" );
w.Write(bs, 0, bs.Length);
Console.WriteLine();
}
}
Console.ReadKey();
图解正则
朋友需要截取img标签的src 和data-url 跟上面差不多。。顺便附上
string text =File.ReadAllText(Environment.CurrentDirectory + "//test.txt" , Encoding.GetEncoding( "gb2312" ));
string prttern = "<img(\\s*(src=\"(?<src>[^\"]*?)\"|data-url=\"(?<dataurl>[^\"]*?)\"|[-\\w]+=\"[^\"]*?\"))*\\s*/>" ;
var maths = Regex.Matches(text, prttern);
//抓取出来写入的文件
using (FileStream w = new FileStream(Environment.CurrentDirectory + "//wirter.txt" , FileMode.Create))
{
for ( int i = 0; i < maths.Count; i++)
{
byte [] bs = Encoding.UTF8.GetBytes( string .Format( "图片src:{0}, 图片data-url：{1}" , maths[i].Groups[ "src" ].Value,
maths[i].Groups[ "dataurl" ].Value) + "\r\n" );
w.Write(bs, 0, bs.Length);
Console.WriteLine();
}
}
希望本文所述对大家C#程序设计有所帮助。
dy("nrwz");
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