I have a string and I want to get whatever is after the 3rd slash so.
I don't know of any other way I can do this, I don't really want to use regex if I dont need it.
http://www.website.com/hello for example would be hello
I have used str.LastIndexOf('/') before like:
string str3 = str.Substring(str.LastIndexOf('/') + 1);
However I am still trying to figure out how to do this for a slash that is not the first or last
string s = "some/string/you/want/to/split";
string.Join("/", s.Split('/').Skip(3).ToArray());
As suggested by C.Evenhuis, you should rely on the native System.Uri class:
string url = "http://stackoverflow.com/questions/20213490/getting-string-after-a-specific-slash"
Uri asUri = new Uri(url);
string result = asUri.LocalPath;
Console.WriteLine(result);
(live at http://csharpfiddle.com/LlLbriBm)
This will output:
/questions/20213490/getting-string-after-a-specific-slash
If you don't want the first / in the result, simply use:
string url = "http://stackoverflow.com/questions/20213490/getting-string-after-a-specific-slash"
Uri asUri = new Uri(url);
string result = asUri.LocalPath.TrimStart('/');
Console.WriteLine(result);
You should take a look in the System.Uri class documentation. There's plenty of property that can you can play with, depending on what you want to actually keep in the url (url parameters, hashtag, etc.)
If you're manipulating URLs, then use the Uri class instead of rolling your own.
But if you want to do it manually for educational reasons, you could do something like this:
int startPos = 0;
for(int i = 0; i < 3; i++)
{
startPos = s.IndexOf('/', startPos)+1;
}
var stringOfInterest = s.Substring(startPos);
There are lots of ways this might fail if the string isn't in the form you expect, so it's just an example to get you started.
Although this is premature optimisation, this sort of approach is more efficient than smashing the whole string into components and putting them back together again.
Related
I need your collective wisdom. I am needing to get a portion of a url so that I can pass it as a parameter to make some stuff happen. Here's what I've got:
here is an example of the url "somesite/somepage/johndoe21911", I am needing to get the "21911" so that I can pass it into this:
var url = Request.ApplicationPath.Replace("/", "");
Session["agencyId"] = _Apps.GetGehaAgencyData(portion needed goes here);
Any direction is greatly appreciated
If your URL looks like an actual URL (with the http:// part) then you could use Uri class:
private static void Extract()
{
Uri uri = new Uri("http://somesite/somepage/johndoe21911");
string last = uri.Segments.LastOrDefault();
string numOnly = Regex.Replace(last, "[^0-9 _]", string.Empty);
Console.WriteLine(last);
Console.WriteLine(numOnly);
}
If it's exactly like in your example (without the http:// part) then you could do something like this:
private static void Extract()
{
string uri = "http://somesite/somepage/johndoe21911";
string last = uri.Substring(uri.LastIndexOf('/') + 1);
string numOnly = Regex.Replace(last, "[^0-9 _]", string.Empty);
Console.WriteLine(last);
Console.WriteLine(numOnly);
}
Above is assuming you want ALL numerics from the last segment of the URL, which is what you've said your requirement is. That is, if your URL were to look like this:
somesite/somepage/john123doe456"
This will extract 123456.
If you want only the last 5 characters, you could simply use string.Substring() to extract the last five characters.
If you want numerics which are at the end of the string then this would work.
private static void Extract()
{
string uri = "somesite/somepage/john123doe21911";
string last = uri.Substring(uri.LastIndexOf('/') + 1);
string numOnly = Regex.Match(last, #"\d+$").Value;
Console.WriteLine(last);
Console.WriteLine(numOnly);
}
Oh and saying I've come across some stuff on google, but wasn't really sure on how to implement them is a very lazy answer. If you Google you can find countless examples of how to do all these things, even on this site itself. Please from next time onward do your research first and try yourself first.
I have a URL like the following
http://yellowcpd.testpace.net
How can I get yellowcpd from this? I know I can do that with string parsing, but is there a builtin way in C#?
Assuming your URLs will always be testpace.net, try this:
var subdomain = Request.Url.Host.Replace("testpace.net", "").TrimEnd('.');
It'll just give you the non-testpace.net part of the Host. If you don't have Request.Url.Host, you can do new Uri(myString).Host instead.
try this
string url = Request.Url.AbsolutePath;
var myvalues= url.Split('.');
How can I get yellowcpd from this? I know I can do that with string
parsing, but is there a builtin way in C#?
.Net doesn't provide a built-in feature to extract specific parts from Uri.Host. You will have to use string manipulation or a regular expression yourself.
The only constant part of the domain string is the TLD. The TLD is the very last bit of the domain string, eg .com, .net, .uk etc. Everything else under that depends on the particular TLD for its position (so you can't assume the next to last part is the "domain name" as, for .co.uk it would be .co
This fits the bill.
Split over two lines:
string rawURL = Request.Url.Host;
string domainName = rawURL .Split(new char[] { '.', '.' })[1];
Or over one:
string rawURL = Request.Url.Host.Split(new char[] { '.', '.' })[1];
The simple answer to your question is no there isn't a built in method to extract JUST the sub-domain. With that said this is the solution that I use...
public enum GetSubDomainOption
{
ExcludeWWW,
IncludeWWW
};
public static class Extentions
{
public static string GetSubDomain(this Uri uri,
GetSubDomainOption getSubDomainOption = GetSubDomainOption.IncludeWWW)
{
var subdomain = new StringBuilder();
for (var i = 0; i < uri.Host.Split(new char[]{'.'}).Length - 2; i++)
{
//Ignore any www values of ExcludeWWW option is set
if(getSubDomainOption == GetSubDomainOption.ExcludeWWW && uri.Host.Split(new char[]{'.'})[i].ToLowerInvariant() == "www") continue;
//I use a ternary operator here...this could easily be converted to an if/else if you are of the ternary operators are evil crowd
subdomain.Append((i < uri.Host.Split(new char[]{'.'}).Length - 3 &&
uri.Host.Split(new char[]{'.'})[i+1].ToLowerInvariant() != "www") ?
uri.Host.Split(new char[]{'.'})[i] + "." :
uri.Host.Split(new char[]{'.'})[i]);
}
return subdomain.ToString();
}
}
USAGE:
var subDomain = Request.Url.GetSubDomain(GetSubDomainOption.ExcludeWWW);
or
var subDomain = Request.Url.GetSubDomain();
I currently have the default set to include the WWW. You could easilly reverse this by switching the optional parameter value in the GetSubDomain() method.
In my opinion this allows for an option that looks nice in code and without digging in appears to be 'built-in' to c#. Just to confirm your expectations...I tested three values and this method will always return just the "yellowcpd" if the exclude flag is used.
www.yellowcpd.testpace.net
yellowcpd.testpace.net
www.yellowcpd.www.testpace.net
One assumption that I use is that...splitting the hostname on a . will always result in the last two values being the domain (i.e. something.com)
As others have pointed out, you can do something like this:
var req = new HttpRequest(filename: "search", url: "http://www.yellowcpd.testpace.net", queryString: "q=alaska");
var host = req.Url.Host;
var yellow = host.Split('.')[1];
The portion of the URL you want is part of the hostname. You may hope to find some method that directly addresses that portion of the name, e.g. "the subdomain (yellowcpd) within TestSpace", but this is probably not possible, because the rules for valid host names allow for any number of labels (see Valid Host Names). The host name can have any number of labels, separated by periods. You will have to add additional restrictions to get what you want, e.g. "Separate the host name into labels, discard www if present and take the next label".
I am trying find a string in below string.
http://example.com/TIGS/SIM/Lists/Team Discussion/DispForm.aspx?ID=1779
by using http://example.com/TIGS/SIM/Lists string. How can I get Team Discussion word from it?
Some times strings will be
http://example.com/TIGS/SIM/Lists/Team Discussion/DispForm.aspx?ID=1779
I need `Team Discussion`
http://example.com/TIGS/ALIF/Lists/Artifical Lift Discussion Forum 2/DispForm.aspx?ID=8
I need `Artifical Lift Discussion Forum 2`
If you're always following that pattern, I recommend #Justin's answer. However, if you want a more robust method, you can always couple the System.Uri and Path.GetDirectoryName methods, then perform a String.Split. Like this example:
String url = #"http://example.com/TIGS/SIM/Lists/Team Discussion/DispForm.aspx?ID=1779";
System.Uri uri = new System.Uri(url);
String dir = Path.GetDirectoryName(uri.AbsolutePath);
String[] parts = dir.Split(new[]{ Path.DirectorySeparatorChar });
Console.WriteLine(parts[parts.Length - 1]);
The only major problem, however, is you're going to wind up with a path that's been "encoded" (i.e. your space is now going to be represented by a %20)
This solution will get you the last directory of your URL regardless of how many directories are in your URL.
string[] arr = s.Split('/');
string lastPart = arr[arr.Length - 2];
You could combine this solution into one line, however it would require splitting the string twice, once for the values, the second for the length.
If you wanted to see a regular expression example:
string input = "http://example.com/TIGS/SIM/Lists/Team Discussion/DispForm.aspx?ID=1779";
string given = "http://example.com/TIGS/SIM/Lists";
System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(given + #"\/(.+)\/");
System.Text.RegularExpressions.Match match = regex.Match(input);
Console.WriteLine(match.Groups[1]); // Team Discussion
Here's a simple approach, assuming that your URL always has the same number of slashes before the are you want:
var value = url.Split(new[]{'/'}, StringSplitOptions.RemoveEmptyEntries)[5];
Here is another solution that provides the following advantages:
Does not require the use of regular expressions.
Does not require a certain 'count' of slashes be present (indexing based of a specific number). I consider this a key benefit because it makes the code less likely to fail if some part of the URL changes. Ultimately it is best to base your parsing logic off which part of the text's structure you consider least likely to change.
This method, however, DOES rely on the following assumptions, which I consider to be the least likely to change:
URL must have "/Lists/" right before target text.
URL must have "/" right after target text.
Basically, I just split the string twice, using text that I expect to be surrounding the area I am interested in.
String urlToSearch = "http://example.com/TIGS/SIM/Lists/Team Discussion/DispForm.aspx";
String result = "";
// First, get everthing after "/Lists/"
string[] temp1 = urlToSearch.Split(new String[] { "/Lists/" }, StringSplitOptions.RemoveEmptyEntries);
if (temp1.Length > 1)
{
// Next, get everything before the first "/"
string[] temp2 = temp1[1].Split(new String[] { "/" }, StringSplitOptions.RemoveEmptyEntries);
result = temp2[0];
}
Your answer will then be stored in the 'result' variable.
I want to use functions of Path class (GetDirectoryName, GetFileName, Combine,etc.) with paths in URL format with slash (/).
Example of my path:
"xxx://server/folder1/folder2/file"
I tried to do the job with Path functions and in the end just replaced the separator.
I've found that the GetDirectoryName function does not correctly replace the slashes:
Path.GetDirectoryName(#"xxx://server/folder/file") -> #"xxx:\server\folder"
Like you see one slash is lost.
How can I cause the Path functions to use the 'alternative' separator?
Can I use another class with the same functionality?
I'm afraid GetDirectoryName, GetFileName, Combine,etc. use Path.DirectorySeparatorChar in the definition and you want Path.AltDirectorySeparatorChar.
And since Path is a sealed class, I think the only way to go about is string replacement.You can replace Path.DirectorySeparatorChar('\') with Path.AltDirectorySeparatorChar('/') and Path.VolumeSeparatorChar(':') with ":/"
For GetDirectoryName(), you can use
pageRoot = uri.Remove(uri.LastIndexOf('/') + 1);
Have you considered using a combination of System.Uri, System.UriBuilder, and (if necessary) custom System.UriParser subclass(es)?
If the URI is a local file URI of the form file://whatever then you can call string path = new Uri(whatever).LocalPath and call the Path methods on it. If you cannot guarantee the Uri is to a local path, you cannot guarantee components of the Uri correspond to machines, folders, files, extensions, use directories, separator characters, or anything else.
Long time after...I was looking for a solution and found this topic, so i decided to make my (very simple) code
string dirRootUpdate = string.Empty;
string fileNameupdate = string.Empty;
string pathToGetUpdate = string.Empty;
string[] _f = Properties.Settings.Default.AutoUpdateServerUrl.Split('/');
for (int i = 0; i < _f.Count() - 1; i++)
{
dirRootUpdate += _f[i];
if (i == 0) // is the first one
{
dirRootUpdate += "/";
}
else if (i != _f.Count() - 2) // not the last one ?
{
dirRootUpdate += "/";
}
}
fileNameupdate = _f[_f.Count() - 1];
the setting "Properties.Settings.Default.AutoUpdateServerUrl" contains the string to be verified
Works fine, may require some refination to look better.
Hope could help someone
I am reading from history, and I want that when i come across a google query, I can extract the query string. I am not using request or httputility since i am simply parsing a string. however, when i come across URLs like this, my program fails to parse it properly:
http://www.google.com.mt/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&hl=mt&source=hp&biw=986&bih=663&q=hotmail&meta=&btnG=Fittex+bil-Google
what i was trying to do is get the index of q= and the index of & and take the words in between but in this case the index of & will be smaller than q= and it will give me errors.
any suggestions?
thanks for your answers, all seem good :) p.s. i couldn't use httputility, not I don't want to. when i add a reference to system.web, httputility isn't included! it's only included in an asp.net application. Thanks again
It's not clear why you don't want to use HttpUtility. You could always add a reference to System.Web and use it:
var parsedQuery = HttpUtility.ParseQueryString(input);
Console.WriteLine(parsedQuery["q"]);
If that's not an option then perhaps this approach will help:
var query = input.Split('&')
.Single(s => s.StartsWith("q="))
.Substring(2);
Console.WriteLine(query);
It splits on & and looks for the single split result that begins with "q=" and takes the substring at position 2 to return everything after the = sign. The assumption is that there will be a single match, which seems reasonable for this case, otherwise an exception will be thrown. If that's not the case then replace Single with Where, loop over the results and perform the same substring operation in the loop.
EDIT: to cover the scenario mentioned in the comments this updated version can be used:
int index = input.IndexOf('?');
var query = input.Substring(index + 1)
.Split('&')
.SingleOrDefault(s => s.StartsWith("q="));
if (query != null)
Console.WriteLine(query.Substring(2));
If you don't want to use System.Web.HttpUtility (thus be able to use the client profile), you can still use Mono HttpUtility.cs which is only an independent .cs file that you can embed in your application. Then you can simply use the ParseQueryString method inside the class to parse the query string properly.
here is the solution -
string GetQueryString(string url, string key)
{
string query_string = string.Empty;
var uri = new Uri(url);
var newQueryString = HttpUtility.ParseQueryString(uri.Query);
query_string = newQueryString[key].ToString();
return query_string;
}
Why don't you create a code which returns the string from the q= onwards till the next &?
For example:
string s = historyString.Substring(url.IndexOf("q="));
int newIndex = s.IndexOf("&");
string newString = s.Substring(0, newIndex);
Cheers
Use the tools available:
String UrlStr = "http://www.google.com.mt/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&hl=mt&source=hp&biw=986&bih=663&q=hotmail&meta=&btnG=Fittex+bil-Google";
NameValueCollection Items = HttpUtility.ParseQueryString(UrlStr);
String QValue = Items["q"];
If you really need to do the parsing yourself, and are only interested in the value for 'q' then the following would work:
string url = #"http://www.google.com.mt/search?" +
"client=firefoxa&rls=org.mozilla%3Aen-" +
"US%3Aofficial&channel=s&hl=mt&source=hp&" +
"biw=986&bih=663&q=hotmail&meta=&btnG=Fittex+bil-Google";
int question = url.IndexOf("?");
if(question>-1)
{
int qindex = url.IndexOf("q=", question);
if (qindex > -1)
{
int ampersand = url.IndexOf('&', qindex);
string token = null;
if (ampersand > -1)
token = url.Substring(qindex+2, ampersand - qindex - 2);
else
token = url.Substring(qindex+2);
Console.WriteLine(token);
}
}
But do try to look at using a proper URL parser, it will save you a lot of hassle in the future.
(amended this question to include a check for the '?' token, and support 'q' values at the end of the query string (without the '&' at the end) )
And that's why you should use Uri and HttpUtility.ParseQueryString.
HttpUtility is fine for the .Net Framework. However that class is not available for WinRT apps. If you want to get the parameters from a url in a Windows Store App you need to use WwwFromUrlDecoder. You create an object from this class with the query string you want to get the parameters from, the object has an enumerator and supports also lambda expressions.
Here's an example
var stringUrl = "http://localhost/?name=Jonathan&lastName=Morales";
var decoder = new WwwFormUrlDecoder(stringUrl);
//Using GetFirstByName method
string nameValue = decoder.GetFirstByName("name");
//nameValue has "Jonathan"
//Using Lambda Expressions
var parameter = decoder.FirstOrDefault(p => p.Name.Contains("last")); //IWwwFormUrlDecoderEntry variable type
string parameterName = parameter.Name; //lastName
string parameterValue = parameter.Value; //Morales
You can also see http://www.dzhang.com/blog/2012/08/21/parsing-uri-query-strings-in-windows-8-metro-style-apps