Remove characters after specific character in string, then remove substring?

I feel kind of dumb posting this when this seems kind of simple and there are tons of questions on strings/characters/regex, but I couldn't find quite what I needed (except in another language: Remove All Text After Certain Point).

I've got the following code:

[Test] public void stringManipulation() { String filename = "testpage.aspx"; String currentFullUrl = ""; String fullUrlWithoutQueryString = currentFullUrl.Replace("?.*", ""); String urlWithoutPageName = fullUrlWithoutQueryString.Remove(fullUrlWithoutQueryString.Length - filename.Length); String expected = ""; String actual = urlWithoutPageName; Assert.AreEqual(expected, actual); } 

I tried the solution in the question above (hoping the syntax would be the same!) but nope. I want to first remove the queryString which could be any variable length, then remove the page name, which again could be any length.

How can I get the remove the query string from the full URL such that this test passes?

8 Answers

For string manipulation, if you just want to kill everything after the ?, you can do this

string input = ""; int index = input.IndexOf("?"); if (index >= 0) input = input.Substring(0, index); 

Edit: If everything after the last slash, do something like

string input = ""; int index = input.LastIndexOf("/"); if (index >= 0) input = input.Substring(0, index); // or index + 1 to keep slash 

Alternately, since you're working with a URL, you can do something with it like this code

System.Uri uri = new Uri(""); string fixedUri = uri.AbsoluteUri.Replace(uri.Query, string.Empty); 

To remove everything before the first /

input = input.Substring(input.IndexOf("/")); 

To remove everything after the first /

input = input.Substring(0, input.IndexOf("/") + 1); 

To remove everything before the last /

input = input.Substring(input.LastIndexOf("/")); 

To remove everything after the last /

input = input.Substring(0, input.LastIndexOf("/") + 1); 

An even more simpler solution for removing characters after a specified char is to use the String.Remove() method as follows:

To remove everything after the first /

input = input.Remove(input.IndexOf("/") + 1); 

To remove everything after the last /

input = input.Remove(input.LastIndexOf("/") + 1); 

Here's another simple solution. The following code will return everything before the '|' character:

if (path.Contains('|')) path = path.Split('|')[0]; 

In fact, you could have as many separators as you want, but assuming you only have one separation character, here is how you would get everything after the '|':

if (path.Contains('|')) path = path.Split('|')[1]; 

(All I changed in the second piece of code was the index of the array.)

The Uri class is generally your best bet for manipulating Urls.

To remove everything before a specific char, use below.

string1 = string1.Substring(string1.IndexOf('$') + 1); 

What this does is, takes everything before the $ char and removes it. Now if you want to remove the items after a character, just change the +1 to a -1 and you are set!

But for a URL, I would use the built in .NET class to take of that.

Request.QueryString helps you to get the parameters and values included within the URL

example

string http = "" string customername = Request.QueryString["customername"].ToString(); 

so the customername variable should be equal to dave

regards

I second Hightechrider: there is a specialized Url class already built for you.

I must also point out, however, that the PHP's replaceAll uses regular expressions for search pattern, which you can do in .NET as well - look at the RegEx class.

you can use .NET's built in method to remove the QueryString. i.e., Request.QueryString.Remove["whatever"];

here whatever in the [ ] is name of the querystring which you want to remove.

Try this... I hope this will help.