extract text from

...

tag or directly from an HTML file

asp.net c# html html-agility-pack regex

Question

I have an HTML page that contains some filenames that i want to download from a webserver. I need to read these filenames in order to create a list that will be passed to my web application that downloads the file from the server. These filenames have some extention.

I have digged about this topic but havn't fount anything except -

  1. Regex cannt be used to parse HTML.
  2. Use HTML Agility Pack

Is there no other way so that i can search for text that have pattern like filename.ext from an HTML file?

Sample HTML that contains filename - 

 <p class=3DMsoNormal style=3D'margin-top:0in;margin-right:0in;margin-bottom=:0in; margin-left:1.5in;margin-bottom:.0001pt;text-indent:-.25in;line-height:normal;mso-list:l1 level3 lfo8;tab-stops:list 1.5in'><![if !supportLists]> <span style=3D'font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman"'><span style=3D'mso-list:Ignore'>1.<span style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    </span></span></span><![endif]><span style=3D'font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman"'>**13572_PostAccountingReport_2009-06-03.acc**<o:p></o:p></span></p>

I cant use HTML Agility Pack because I m not allowed to download and make use of any application or tool.

Cant this be achieved by anyother logic?

This is what i have done so far

string pageSource = "";
            string geturl = @"C:\Documents and Settings\NASD_Download.mht";
            WebRequest getRequest = WebRequest.Create(geturl);
            WebResponse getResponse = getRequest.GetResponse();
            using (StreamReader sr = new StreamReader(getResponse.GetResponseStream()))
            {
                pageSource = sr.ReadToEnd();
                pageSource.Replace("=", "");
            }
           var fileNames = from Match m in Regex.Matches(pageSource, @"[0-9]+_+[A-Za-z]+_+[0-9]+-+[0-9]+-+[0-9]+.+[a-z]")
                          select m.Value;
            foreach (var s in fileNames)
                Response.Write(s);

Bcause of some "=" occuring in every file name i m not able to get the filename. how can I remove the occurrence of "=" in pageSource string

Thanks in advance

Akhil

1
0
6/27/2012 10:26:47 AM

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Accepted Answer

Well, knowing that regex aren't ideal to find values in HTML:

var files = [];
var p = document.getElementsByTagName('p');

for (var i = 0; i < p.length; i++){
    var match = p[i].innerHTML.match(/\s(\S+\.ext)\s/)

    if (match)
        files.push(match[1]);
}

Live DEMO

Note: Read the comments to the question.

If the extension can be anything, you can use this:

var files = [];
var p = document.getElementsByTagName('p');

for (var i = 0; i < p.length; i++){
    var match = p[i].innerHTML.match(/\b(\S+\.\S+)\b/)
    console.log(match)
    if (match)
        files.push(match[1]);
}
document.getElementById('result').innerHTML = files + "";

​ But this really really not reliable.

Live DEMO

0
6/27/2012 8:51:52 AM

Popular Answer

It may be impossible to get file names using common pattern because of 1.5in -.25in 7.0pt and the likes, try to be more specific (if possible), like
/[a-z0-9_-]+\.[a-z]+/gi or
/>[a-z0-9_-]+\.[a-z]+</gi (markup included) or even
/>\d+_PostAccountingReport_\d+-\d+-\d+\.[a-z]+</gi

Leonid

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