C# regex question - help

Question

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"

Guffa · Accepted Answer · 2011-03-18 17:18:15Z

4

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);

answered Mar 18, 2011 at 17:18

Guffa

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3 Comments

xanatos Over a year ago

+1 Just because you aren't using Regexes. (RANT MODE ON) I'm quite tired of persons that don't know how to compose Regexes and try to use them even to go to the bathroom... I've programmed for more than 10 years before learning Regexes and I was always happy with strstr, strcpy... Why now everyone wants to use regexes?

Hooch Over a year ago

I want regex. It looks nicer.

xanatos Over a year ago

@Hooch If you want nicer take a Mac. Code must be maintainable. If you can't write Regexes, you don't write Regexes.

CanSpice · Accepted Answer · 2011-03-18 17:16:41Z

3

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

That should do it.

answered Mar 18, 2011 at 17:16

CanSpice

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Comments

xanatos · Accepted Answer · 2011-03-18 17:18:08Z

0

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.

answered Mar 18, 2011 at 17:18

xanatos

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Comments

WorldIsRound · Accepted Answer · 2011-03-18 17:20:40Z

-1

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

answered Mar 18, 2011 at 17:20

WorldIsRound

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1 Comment

Polyfun Over a year ago

My guess is: you are not actually capturing the number, and MB is not at the end of the string (so do not use $).

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