regular expression in c# [modified]

benjamin yap

Hi, i want to retrieve some content from a webpage. The method below retrieve the webpage content (in html).

    public string GetWebpageContent(string StockQuote)
    {
        //Store url + desired Stock Quote
        //E.g. NYSE, MSFT
        string serverURL = "http://www.google.com/finance?q=" + StockQuote;

        //Create a HTTP request based on url
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serverURL);

        //Retrieve byte response from server base on the above request
        WebResponse response = request.GetResponse();

        //Retrieve content using StreamReader
        StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.ASCII);

        //Read content
        string retVal = reader.ReadToEnd();

        //Close the stream reader
        reader.Close();

        //Return data
        return retVal;
    }

Below method retrieve the stockprice in the web content. the html i wan to read consist this

<div>After Hours: 10.60

I wan to retrieve the value 10.60 The id="ref_21913_el" is not a fix value, so i have to read base on

<span class=bld....

  public string GetStockPrice()
    {
        //Used to store the reverse Stock Price
        StringBuilder ReversePrice = new StringBuilder();

        //Store the actual price
        string Price = "";

        //Match the webpage content with the following pattern

        MatchCollection StockQuote = Regex.Matches(urlContent, "", RegexOptions.Singleline);

        //Retrieve the first matched result
        string StockPriceTag = StockQuote\[0\].Value; //"<span class=\\"pr\\">\\n<span id=\\"ref\_705173\_l\\">26.83</span>"

        //Remove closing </span> tag
        string WithoutEndSpanTag = StockPriceTag.Remove(StockPriceTag.Length - 7, 7); //<span class=\\"pr\\">\\n<span id=\\"ref\_705173\_l\\">26.83

        //Traverse through individual characters starting from the back
        for (int i = WithoutEndSpanTag.Length - 1; i >= 0; i--)
        {
            //Covert string to individual characters
            char\[\] AllChar = WithoutEndSpanTag.ToCharArray();

            //Check current item is not '>'
            if (AllChar\[i\] != '>')

vivasaayi

If I were u I, I will change the StockPriceTag string to "<root>\n26.83 </root>". Then load it in an XML Document. Where you can simple read the value of Span tag. Cheers.

PIEBALDconsult

Here's a Regular Expression that will match your span and put the price in a named group: \(?'Price'[\d\.]*)\</span\> Read up on what Regular Expressions can do.