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：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
//读取网页htmlstring 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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
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。
