正则表达式
// Create a request for the URL.
string strUrl;
strUrl = "http://www.google.cn ";
WebRequest request = HttpWebRequest.Create(strUrl);
// If required by the server, set the credentials.
request.Credentials = CredentialCache.DefaultCredentials;
// Get the response.
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// Display the status.
//Response.Write(response.StatusCode);
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream, System.Text.Encoding.Default);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
string pattern = @ " <(((a|link).*href)|((img|script).*src)|(form.*action))\s*=\s*[ " " ']?(? <link> [^ ' " "\s]*) ";
Regex reg = new Regex(pattern, RegexOptions.IgnoreCase);
for (Match m = reg.Match(responseFromServer); m.Success; m = m.NextMatch())
{
Response.Write(m.Groups[ "link "].Value.ToString()+ " <br> ");
}
Response.Write(responseFromServer);
// Cleanup the streams and the response.
reader.Close();
dataStream.Close();
response.Close();
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其中的正则表达式能解析出网页中带引号的地址，但为什么不带引号的出不来？
请大家帮我看一下吧，先谢谢了。
[解决办法]
你的正则表达式
string pattern = @ " <(((a|link).*href)|((img|script).*src)|(form.*action))\s*=\s*[ " " ']?(? <link> [^ ' " "\s]*) ";
应该可以解析出不带引号的地址，只不过会多一些不需要的如“> ”之类的附加文本吧
因为你用的(? <link> [^ ' " "\s]*)对没有引号的地址的边界条件是不够的，可以用下面的试一下
string pattern = @ " <(((a|link).*href)|((img|script).*src)|(form.*action))\s*=\s*[ " " ']?(? <link> [^ ' " "\s> ]*) ";
这里要在最后的[]内加入不带引号的地址后面，你可以确定的如“> ”等普通字符，根据具体情况，加进去就可以了
