I am trying to create a new string, which removes certain characters from an existing string e.g.
string path = "C:\test.txt"
so string "pathminus" will take out the "C:\" e.g.
string pathminus = "test.txt"
Use Path.GetFileName
Eg:
string pathminus = Path.GetFileName(path);
There's so many ways that you can remove the a certain part of a string. These are a couple of ways to do it:
var path = #"C:\test.txt";
var root = #"C:\";
Using string.Remove()
var pathWithoutRoot = path.Remove(0, root.Length);
Console.WriteLine(pathWithoutRoot); // prints test.txt
Using string.Replace()
pathWithoutRoot = path.Replace(root, "");
Console.WriteLine(pathWithoutRoot); // prints test.txt
Using string.Substring()
pathWithoutRoot = path.Substring(root.Length);
Console.WriteLine(pathWithoutRoot); // prints test.txt
Using Path.GetFileName()
pathWithoutRoot = Path.GetFileName(path);
Console.WriteLine(pathWithoutRoot); // prints test.txt
You can also use Regular Expression to find and replace parts of a string, this is a little bit harder though. You can read on MSDN on how to use Regular Expressions in C#.
Here's a complete sample on how to use string.Remove(), string.Replace(), string.Substring(), Path.GetFileName() and Regex.Replace():
using System;
using System.IO;
using System.Text.RegularExpressions;
namespace ConsoleApplication5
{
class Program
{
static void Main(string[] args)
{
var path = #"C:\test.txt";
var root = #"C:\";
var pathWithoutRoot = path.Remove(0, root.Length);
Console.WriteLine(pathWithoutRoot);
pathWithoutRoot = Path.GetFileName(path);
Console.WriteLine(pathWithoutRoot);
pathWithoutRoot = path.Replace(root, "");
Console.WriteLine(pathWithoutRoot);
pathWithoutRoot = path.Substring(root.Length);
Console.WriteLine(pathWithoutRoot);
var pattern = "C:\\\\";
var regex = new Regex(pattern);
pathWithoutRoot = regex.Replace(path, "");
Console.WriteLine(pathWithoutRoot);
}
}
}
It all depends on what you want to do with the string, in this case you might want to remove just C:\ but next time you might want to do other types of operations with the string, maybe remove the tail or such, then the above different methods might help you out.
The string class offers all sorts of ways to do this.
If you want to change "C:\test.txt" to "test.txt" by removing the first three characters:
path.Substring(3);
If you want to remove "C:\" from anywhere in the string:
path.Replace("C:\", "");
Or if you specifically want the filename, regardless of how long the path is:
Path.GetFileName(path);
Depending on your intentions, there are many ways to do it. I prefer using the static class Path.
For this specific example, I would look into the Path Class. For your example, you can just call:
string pathminus = Path.GetFileName(path);
Have you looked at the Substring method?
If the string is actually a file path, use the Path.GetFileName method to get the file name part of it.
path.SubString(path.IndexOf('\'))
You want System.Text.RegularExpressions.Regex but exactly what are you trying do here?
In its simplest form:
[TestMethod]
public void RemoveDriveFromPath()
{
string path = #"C:\test.txt";
Assert.AreEqual("test.txt", System.Text.RegularExpressions.Regex.Replace(path, #"^[A-Z]\:\\", string.Empty));
}
Are you just trying to get the file name of a file without the path?
If so do this instead:
[TestMethod]
public void GetJustFileName()
{
string path = #"C:\test.txt";
var fileInfo = new FileInfo(path);
Assert.AreEqual("test.txt", fileInfo.Name);
}
For more general strings, use the string.Split(inputChar), which takes a character as a parameter and splits the string into a string[] wherever that inputChar is found.
string[] stringArr = path.Split('\\'); // need double \ because \ is an escape character
// you can now concatenate any part of the string array to get what you want.
// in this case, it's just the last piece
string pathminus = stringArr[stringArr.Length-1];
Related
I have a string
"\uploads\test1\test2.file"
What's the method to get just "test2.file"?
What I have in my mind is to get the last index of "\" and then perform a string.substring(last index of "\") command on it?
Is there a method that takes just the word after the last "\"?
Use the method Path.GetFileName(path); in System.IO namespace, it is much more elegant than doing string operations.
You could use LINQ:
var path = #"\uploads\test1\test2.file";
var file = path.Split('\\').Last();
You might want to validate the input, if you're concerned about path potentially being null or whatnot.
You could do something like this:
string path = "c:\\inetpub\\wwwrroot\\images\\pdf\\admission.pdf";
string folder = path.Substring(0,path.LastIndexOf(("\\")));
// this should be "c:\inetpub\wwwrroot\images\pdf"
var fileName = path.Substring(path.LastIndexOf(("\\"))+1);
// this should be admin.pdf
For more take a look at here How do I get the last part of this filepath?
Hope it helps!
You can use the Split method:
string myString = "\uploads\test1\test2.file";
string[] words = myString.Split("\");
//And take the last element:
var file = words[words.lenght-1];
using linq:
"\uploads\test1\test2.file".Split('\\').Last();
or you can do it without linq:
string[] parts = "\uploads\test1\test2.file".Split('\\');
last_part=parts[parts.length-1]
I am new in programming and not so good about regex. I wish to load / read a csv File and then save in a txt File using the same name of csv File. I will give an example.
D:\Project\File\xxx.csv
After I load this file, I want to get the name "xxx" and save it in a txt file:
D:\Project\File\xxx.txt
Or maybe in another folder, for example:
D:\Project\Specifications\PersonInfo.csv
save to
D:\Project\DataBank\PersonInfo.txt
This can be accomplished in many ways.
Maybe what you're lacking is knowledge of the System.IO.Path class (MSDN article here).
For instance changing the extension could be accomplished like so:
string originalFilePath = #"D:\Project\File\xxx.csv";
string newFilePath = Path.ChangeExtension(originalFilePath, ".txt");
Note: You need to explicitate the leading dot (".") for the extension.
Here's some "Path algebra" fun you could combine to create your desired effects:
string originalFilePath = #"D:\Project\File\xxx.csv";
string thePath = Path.GetDirectoryName(originalFilePath);
// will be #"D:\Project\File"
string filename = Path.GetFileName(originalFilePath);
// will be "xxx.csv"
string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(originalFilePath);
// will be "xxx"
string recombinedFilePath = Path.Combine( #"D:\OtherFolder", "somethingElse.txt" );
// will be #"D:\OtherFolder\somethingElse.txt"
Note: Path.Combine knows how to handle extra/missing leading/trailing backslashes.
For example:
Path.Combine(#"D:\MyFolder1", #"MyFolder2\MyFile.txt")
Path.Combine(#"D:\MyFolder1\", #"MyFolder2\MyFile.txt")
Path.Combine(#"D:\MyFolder1", #"\MyFolder2\MyFile.txt")
Path.Combine(#"D:\MyFolder1\", #"\MyFolder2\MyFile.txt")
will all yield the same result: #"D:\MyFolder1\MyFolder2\MyFile.txt"
You do not need regex for that, because .NET provides a System.IO.Path class for dealing specifically with file name manipulations.
For example, to replace .csv with .txt you can use this call:
var csvPath = #"D:\Project\File\xxx.csv";
var txtPath = Path.Combine(
Path.GetDirectoryName(csvPath)
, Path.GetFileNameWithoutExtension(csvPath)+".txt"
);
You use a similar trick to replace other parts of the file path. Here is how you change the name of the top directory:
var csvPath = #"D:\Project\Specifications\xxx.csv";
var txtPath = Path.Combine(
Path.GetDirectoryName(Path.GetDirectoryName(csvPath))
, "DataBank"
, Path.GetFileNameWithoutExtension(csvPath)+".txt"
);
You don't need Regex.
You can use Path.GetFileName or Path.GetFileNameWithoutExtension:
string fileName = Path.GetFileNameWithoutExtension("D:\Project\Specifications\PersonInfo.csv");
If you want to use regex for this, this regex will get the part you want:
([^\\]+)\.[^.\\]+$
The first group (in the parentheses) matches one or more characters (as many as possible) which is not a backslash. Then there need to be a literal dot. Then one or more characters (as many as possible) that are not a dot or backslash, then the end of the string. The group captures the wanted part.
How do I remove characters in the middle of each file name in a directory?
My directory is filled with files like: "Example01.1234312232.txt", "Example02.2348234324.txt", etc.
I would like to remove the ".1234312232" so it will named "Example01.txt", and do this for every file in the directory.
Each file name will always have the same number of characters in it.
You could use
string fileNameOnly = Path.GetFileNameWithoutExtension(path);
string newFileName = string.Format("{0}{1}",
fileNameOnly.Split('.')[0],
Path.GetExtension(path));
Demo
For what it's worth, the complete code for your directory-renaming problem:
foreach (string file in Directory.GetFiles(folder))
{
string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string newFileName = string.Format("{0}{1}",
fileNameOnly.Split('.')[0],
Path.GetExtension(file));
File.Move(file, Path.Combine(folder, newFileName));
}
The simplest way would be to use a regular expression replacement of
\.\d+
for an empty string "":
var str = "Example01.1234312232.txt";
var res = Regex.Replace(str, #"\.\d+", "");
Console.WriteLine("'{0}'", res);
Here is a link to a demo on ideone.
You'll have to use the IO.DirectoryInfo class and the GetFiles function to get the list of files.
Loop all files and do a substring to get the string you want.
Then you call My.Computer.Filesystem.RenameFile to rename the files.
Use this:
filename.Replace(filename.Substring(9, 15), ".txt")
You can hard code the index and length because you said the number of characters have same length.
Use Directory.EnumerateFiles to enumerate the files, Regex.Replace to get the new name and File.Move to rename files:
using System.IO;
using System.Text.RegularExpressions;
class SampleSolution
{
public static void Main()
{
var path = #"C:\YourDirectory";
foreach (string fileName in Directory.EnumerateFiles(path))
{
string changedName = Regex.Replace(fileName, #"\.\d+", string.Empty);
if (fileName != changedName)
{
File.Move(fileName, changedName);
}
}
}
}
How to remove the some characters in a string ..
string s="testpage\information.xml"
I need only information.xml how to do that?
System.IO.Path may help you with this since the string contains a file path information. In your case, you may use Path.GetFileName(string path) to get the file name from a string.
Example
string s = #"testpage\information.xml";
string filename = Path.GetFileName(s);
//MessageBox.Show(filename);
Thanks,
I hope you find this helpful :)
Assuming the value that will be in s is always a file path, use the Path class to extract the file name
var filename = Path.GetFileName(s);
File path is of the form
aaaa\bbb\ccc\dddd\information.xml
To retrieve the last string, you can divide your string using the delimiter \
String path = #"aaaa\bbb\ccc\dddd\information.xml";
String a[] = path.Split('\\');
This will give String array as ["aaaa", "bbb", "ccc", "dddd", "information.xml"]
You can retrieve the filename as
String filename = a[a.Length-1];
If it is going to be a file path, then you can use the System.IO.Path class (MSDN) to extract the filename.
string s = "testpage\information.xml"
var filename = Path.GetFilename(s);
If it's always right of the backslash separator then you can use:
if (s.Contains(#"\"))
s= s.Substring(s.IndexOf(#"\") + 1);
Hope this is what you want:
var result=s.Substring(s.LastIndexOf(#"\") + 1);
If you are using file paths, see the Path.GetFileName Method
It will not check whether the file exists or not. So it will be faster.
s = Path.GetFileName(s);
If you need to check whether file exists, use File.Exists class.
Another way is to use String.Split() method
string[] arr = s.Split('\\');
if(arr.Length > 0)
{
s = arr[arr.Length - 1];
}
Another way is to use RegEx
s = Regex.Match(s, #"[^\\]*$").Value;
You can use the following line of codes to get file extension.
string filePath = #"D:\Test\information.xml";
string extention = Path.GetExtension(filePath);
If you need file name alone use,
string filePath = #"D:\Test\information.xml";
string filename = Path.GetFilename(filePath );
Use string.Replcae
string s = #"testpage\information.xml";
s = s.Replace(#"testpage\\",""); // replace 'testpage\' with empty string
You will get Output => s=information.xml
# is need only because you have backslash in your string
For further reading about STRING REPLACE
http://www.dotnetperls.com/replace
http://msdn.microsoft.com/en-us/library/system.string.replace.aspx
In C++ you can do something like this. Basically search for "/" or "\" from right to left of the path and crop the string starting from the first occurance of the delimiter:
string ExtractFileName(const string& strPathFileName)
{
size_t npos;
string strOutput = strPathFileName;
if(strPathFileName.rfind(L'/', npos) || strPathFileName.rfind(L'\\', npos))
{
strOutput = strPathFileName.substr(npos+1);
}
return strOutput;
}
I have a method which is doing a file copy. The 'root' is specified by the user on the command line, which I sanitize with Path.GetFullPath(input).
I need to get the path of the file relative to that root, so the following cases would return:
Root FilePath Return
y:\ y:\temp\filename1.txt temp\filename1.txt
y:\dir1 y:\dir1\dir2\filename2.txt dir2\filename2.txt
You can write
var relative = new Uri(rootPath).MakeRelativeUri(new Uri(filePath));
http://msdn.microsoft.com/en-us/library/system.uri.makerelativeuri.aspx
string s1 = "y:\\";
string s2 = "y:\\temp\filename1.txt";
Console.WriteLine(s2.Substring(s1.Length)); \\ Outputs temp\filename1.txt
Hope this helps
Might want to call a .Trim() as well to ensure removing trailing \ characters or the like.
System.IO.Path.GetFullPath( filePath ).Substring( rootPath.Length )
string relativePath = Path.GetFullPath(input).Replace(rootPath, "");