Regex to match and remove parameter in URL

Question

I have an url like localhost:8001/?page=categories&catid=4&p=1888&country=1,2,3,6 and I want to remove &p=1888 part with regular expression. How can I match & exclude this part with asp.net c#?

Edit: Here is the function I've created for solution:

public string RemoveUrlParameters(HttpContext Context, string[] Parameters)
{
    string result = String.Empty;

    UriBuilder urlBuilder = new UriBuilder(Context.Request.Url.AbsoluteUri);
    var values = HttpUtility.ParseQueryString(urlBuilder.Query);

    for (int i = 0; i < Parameters.Length; i++)
        values.Remove(Parameters[i]);

    urlBuilder.Query = values.ToString();
    result = urlBuilder.ToString();
    result = Context.Server.UrlDecode(
    result.Replace("http://" + Context.Request.Url.Authority, String.Empty)
    .Replace(":80", String.Empty).Replace("default.aspx", String.Empty));

    return result;
}

Darin Dimitrov · Accepted Answer · 2011-09-04 09:15:50Z

9

I want to remove &p=1888 part with regular expression

I would recommend you to use url parsers, to avoid fragility of your code and guarantee that it will work for any valid url 100% of the cases because they respect the RFCs:

var url = "http://localhost:8001/?page=categories&catid=4&p=1888&country=1,2,3,6";
var urlBuilder = new UriBuilder(url);
var values = HttpUtility.ParseQueryString(urlBuilder.Query);
values.Remove("p");
urlBuilder.Query = values.ToString();
var newUrl = urlBuilder.ToString();

Implementing a valid URL parser with Regex could be quite challenging and not worth it especially when the .NET framework already provides you the tools to manipulate urls.

answered Sep 4, 2011 at 9:15

Darin Dimitrov

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Comments

Kirill Polishchuk · Accepted Answer · 2011-09-04 09:16:09Z

0

Regex.Replace(input, @"&p=1888(?=&|$)", string.Empty)

answered Sep 4, 2011 at 9:16

Kirill Polishchuk

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