Regex named group empty

Question

This is my program:

 class Program
    {
        private static Regex _regex = new Regex("<span id='TotalG'>$ (?<amount>.*?)</span>", RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Compiled);

        static void Main(string[] args)
        {

            string text = File.ReadAllText("file.txt");

            var match = _regex.Match(text);

            var group = match.Groups["amount"];

          //  Console.ReadKey();

        }
    }

The text does contain this text:

<td align="right" bgcolor=c0c0c0 style="font-weight:bold"> <span id='TotalG'>$ 0.00</span></td>
        <td>&nbsp;</td></tr>

yet the named group is always empty. Any idea why would this happen?

your regex doesn't even match,

Dave Bish
– Dave Bish

2013-06-06 09:38:09 +00:00
Commented Jun 6, 2013 at 9:38 — Dave Bish
– Dave Bish, Commented Jun 6, 2013 at 9:38

YoryeNathan · Accepted Answer · 2013-06-06 09:38:48Z

3

Escape the $, < and > by adding a backslash before it.

And I would actually suggest a different regex for the named group as well:

"\\<span id='TotalG'\\>\\$(?<amount>[^\\<]*)\\</span\\>"

I'm pretty sure that >'s and <'s should only be escaped when in (parenthesis), but I rather escape stuff instead of remembering regex rules.

answered Jun 6, 2013 at 9:38

YoryeNathan

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Comments

Damith · Accepted Answer · 2013-06-06 09:44:32Z

0

If you are processing html you can use help of Html agile pack

var doc = new HtmlDocument();
doc.Load("test.html");
var node = doc.DocumentNode.SelectSingleNode("//span[@id='TotalG']");
if (node != null)
{
    var temp = node.InnerText;
}

answered Jun 6, 2013 at 9:44

Damith

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