RegEx: Match same string into 2 named groups

Question

I have the following C# code:

string MyString = "<a href=\"magnet:?xt=urn:btih:7f3befa467c4cac0787286c87ea264a0606066f5&dn=some.file.name.zip&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.istole.it%3A6969&tr=udp%3A%2F%2Ftracker.ccc.de%3A80\" title=\"Download this torrent using magnet\">...</a>[Some unwanted stuff here]<a href=[Another]>";

MatchCollection MyMatches = Regex.Matches(MyString, "(?<URL>magnet:\\?.*?)(?:\"|')");           
foreach(Match MyMatch in MyMatches)
{
    MessageBox.Show(MyMatch.Groups["URL"].Value);
}

My question is: how can I also put &dn=some.file.name.zip into a named group called <File>?

To parse htmls you can use HtmlAgilityPack, to parse url, you have the Uri and HttpUtility classes. — L.B
– L.B, Commented Nov 27, 2012 at 7:24
@L.B HtmlAgilityPack is overkill for this particular scenario; but thanks! — Danny Beckett
– Danny Beckett, Commented Nov 27, 2012 at 7:25

RePierre · Accepted Answer · 2012-11-27 07:21:54Z

1

string MyString = "<a href=\"magnet:?xt=urn:btih:7f3befa467c4cac0787286c87ea264a0606066f5&dn=some.file.name.zip&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.istole.it%3A6969&tr=udp%3A%2F%2Ftracker.ccc.de%3A80\" title=\"Download this torrent using magnet\">...</a>[Some unwanted stuff here]<a href=[Another]>";

MatchCollection MyMatches = Regex.Matches(MyString, "(?<URL>magnet:\\?.*(&dn=(?<File>[^&]+)).*?)(?:\"|')");           
foreach(Match MyMatch in MyMatches)
{
    MessageBox.Show(MyMatch.Groups["URL"].Value);
    MessageBox.Show(MyMatch.Groups["File"].Value);
}

answered Nov 27, 2012 at 7:21

RePierre

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