C# regex question - help

How can I get MB of transfer left from this string?

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Transfer: 21410.73 MB<br/><span title="Dziennie limit ściąganie z RS zwiększany jest o 500MB, kumuluje się maksymalnie do 2500MB. Podczas pobierania z RS, limit jest obniżany a transfer pobierany jest z konta podstawowego.">z czego max 2500 MB na RS <a href="konto,rs"><img src="style/img/ico/info_icon.png" border="0"/></a></span><br/> 
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I don't know how regex have look to get one group with this: "21410.73"

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Using regular expression for that seems overkill. Just look for the string "Transfer: " and then look for the following " MB", and get what's between:

int start = str.IndexOf("Transfer: ") + 10;
int end = str.IndexOf(" MB", start);
string mb = str.Substring(start, end - start);

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Match m = Regex.Match(string, @"Transfer: ([0-9.]+) MB");
if (m.Success)
{
    string remaining = m.Groups[1].Value
}

That should do it.

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var rx = new Regex(@"Transfer: ([0-9]+(?:\.[0-9]+)?)");
var result = rx.Match(html).Groups[1].Value;

BUT you shouldn't parse html with Regex. I'm "anchoring" the regex to the "Transfer: " string.

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Match match = Regex.Match(string, @"Transfer: [0-9.]+ MB$");
if (match.Success)
   var dataLeft = match.Groups[1].Value;

I often use this online tester for my reg-ex tests : http://derekslager.com/blog/posts/2007/09/a-better-dotnet-regular-expression-tester.ashx