Removing "." (periods) in IP address using regex

Posted on 2008-10-27
Last Modified: 2013-12-17
Having trouble with the following code.  Not sure why it's not working.  I'm trying to remove the periods (.) from IP addresses, so that I just have a 12 digit number.  For example the IP address of 123.456.789.101 should be converted into 123456879101.  I know the problem is in my regex statement.  If I comment the regex line out, and simply use the  "string ipNumber = ip;" then I get the IP address printed out as expected.  However, if I use the regex line, then the output is blank or null.
public partial class _Default : System.Web.UI.Page
    string userIP = HttpContext.Current.Request.UserHostAddress;
    protected void Page_Load(object sender, EventArgs e)
        lbAddress.Text = "IP-Address: " + hostAddress + " IP-Number: " + IPAddressConverter(userIP);
    protected string IPAddressConverter(string ip)
        string ipNumber = Regex.Replace(ip, ".", "");
        //string ipNumber = ip;
        return ipNumber;

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Question by:P1ST0LPETE
LVL 84

Accepted Solution

ozo earned 240 total points
ID: 22815820
try \. or [.]

Assisted Solution

gdupadhyay earned 240 total points
ID: 22815914

string ipNumber  = Regex.Replace(ip, "[.]", "");
I will work.
LVL 13

Assisted Solution

TechTiger007 earned 20 total points
ID: 22815978
why dont you try this

protected string IPAddressConverter(string ip)
        string ipNumber = ip.Replace(".", "");
        //string ipNumber = ip;
        return ipNumber;

LVL 10

Author Comment

ID: 22825112
That didn't make much sense.  The code you posted, is the code I'm already using and didn't work.
LVL 10

Author Closing Comment

ID: 31510471
Thank you ozo and qdupadhyay.

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