I am kinda new to regex, I have a string e.g
String test = #"c:\test\testing";
Now what I would like to accomplish is to removing all words up to "\". So in this case the work being removed is "testing". Howerver, this word may be different everytime.
So bascally remove everyting until the first \ is found.
Any ideas?
You mean remove backwards, until the first \ is found?
You could easily do this without regexes:
var lastIndex = myString.LastIndexOf('\\');
if (lastIndex != -1)
{
myString = myString.Substring(0, lastIndex + 1); // keep the '\\' you found
}
But if you're really just trying to get the directory component of a path, you can use this:
var directoryOfPath = System.IO.Path.GetDirectoryName(fullPath);
Although IIRC that method call will strip the trailing backslash.
You can use the following regex pattern:
(?!\\)([^\\]*)$
Do a replace on this pattern with the empty string, as shown below:
var re = new Regex(#"(?!\\)([^\\]*)$");
var result = re.Replace(#"c:\test\testing", string.Empty);
Console.WriteLine(result);
However, consider using the System.IO namespace, specifically the Path class, instead of Regex.
Try this
\\\w+$ and replace it with \
Or you can use the following approach
(?<=\\)\w+$ In this case you just replace the match with an empty string.
regex.replace(str,"^.*?\\","");
I prefer to use the DirectoryInfo for this, or even a substring action.
DirectoryInfo dir = new DirectoryInfo(#"c:\test\testing");
String dirName = dir.Name;
You can do this without regex:
String test = #"c:\test\testing";
int lastIndex = test.LastIndexOf("\");
test = test.Remove(0, lastIndex >= 0 ? lastIndex : 0);
If you want to "remove" or manipulate file paths, you can skip the basic Regex class altogether and use the class Path from System.IO. This class will give you suitable methods for all you needs in changing/extracting file names.
Related
I have such types of file paths:
\\server\folder\folder1\folder3\someFile.txt,
\\otherServer\folder123\folder1\folder3\someFile.txt
\\serv\fold\folder3\folder4\someFile.txt
I need to remove the first two segments of this path to make them as follows:
folder1\folder3\someFile.txt,
folder1\folder3\someFile.txt
folder3\folder4\someFile.txt
I'm doing it with c# and Regex.Replace but need a pattern.
Thanks.
It seems, that you work files' paths, and that's why I suggest using Path not Regex:
using System.IO;
...
string source = #"\\serv\fold\folder3\folder4\someFile.txt";
var result = Path.IsPathRooted(source)
? source.Substring(Path.GetPathRoot(source).Length + 1)
: source;
If you insist on regular expressions then
string result = Regex.Replace(source, #"^\\\\[^\\]+\\[^\\]+\\", "");
You can use the following regular expression pattern to remove the first two segments:
^\\[^\\]+\\[^\\]+\\
you can use Regex.Replace in C#
example:
string input = "\\\\server\\folder\\folder1\\folder3\\filename.txt";
string pattern = "^\\\\[^\\\\]+\\\\[^\\\\]+\\\\";
string replacement = "";
var result = Regex.Replace(input, pattern, replacement);
output:
folder1\folder3\filename.txt
I have this:
MyString = #"C:\\Somepath\otherpath\etc\string";
And i need this string (which can be longer than a group of characters)
How can i do something like:
NewString = MyString.Right(string, when last "\" is found) ?
For a path specifically, you can use Path.GetFileName(String).
var MyString = #"C:\Somepath\otherpath\etc\string";
var NewString = Path.GetFileName(MyString);
Despite the name of the method, it also works on directory names, provided they aren't followed by a trailing backslash. So C:\directory becomes directory, but C:\directory\ becomes the empty string. (This might be what you want, based on how you phrased the question.)
Depending on your environment, you might be able to use the new indices and range features that came with C# 8.0
var result = MyString.Split('\\')[^1];
Indices and Ranges
This will return everything after the last instance of the character '\'.
var result = MyString.Substring(MyString.LastIndexOf('\\') + 1);
If you don't mind using a bit of LINQ:
var result = MyString?.Split('\\').LastOrDefault();
I have a string:
1/45 files checked
I want to parse the numbers (1 and 45) out of it, but first, to check if a string matches this pattern at all. So I write a regex:
String line = "1/45 files checked";
Match filesProgressMatch = Regex.Match(line, #"[0-9]+/[0-9]+ files checked");
if (filesProgressMatch.Success)
{
String matched = filesProgressMatch.Groups[1].Value.Replace(" files checked", "");
string[] numbers = matched.Split('/');
filesChecked = Convert.ToInt32(numbers[0]);
totalFiles = Convert.ToInt32(numbers[1]);
}
I expected matched to contain "1/45", but it is, in fact, empty. What's my mistake?
My first thought was '/' is a special character in a regex, but that doesn't seem to be the case.
P. S. Is there a better way to parse these values from such string in C#?
Your regex is matching, but you are selecting Groups[1] where the count of groups is one. So use
String matched = filesProgressMatch.Groups[0].Value.Replace(" files checked", "");
And you should be fine
Try this regex:
You need to escape the forward slash
([0-9]+\/[0-9]+) files checked
Demo
Use capture group:
Regex.Match(line, #"([0-9]+/[0-9]+) files checked");
# here __^ and __^
You could also use 2 groups:
Regex.Match(line, #"([0-9]+)/([0-9]+) files checked");
Applying the replace operation to the first element of filesProgressMath.Groups seems to work.
String matched = filesProgressMatch.Groups[0].Value.Replace(" files checked", "");
This should give you your results
string txtText = #"1\45 files matched";
int[] s = System.Text.RegularExpressions.Regex.Split(txtText, "[^\\d+]").Where(x => !string.IsNullOrEmpty(x)).Select(x => Convert.ToInt32(x)).ToArray();
I'm trying to create a new file path in regex, in order to move some files. Say I have the path:
c:\Users\User\Documents\document.txt
And I want to convert it to:
c:\Users\User\document.txt
Is there an easy way to do this in regex?
If all you need is to remove the last folder name from the file path then I think it would be easier to use built-in FileInfo, DirectoryInfo and Path.Combine instead of regular expressions here:
var fileInfo = new FileInfo(#"c:\Users\User\Documents\document.txt");
if (fileInfo.Directory.Parent != null)
{
// this will give you "c:\Users\User\document.txt"
var newPath = Path.Combine(fileInfo.Directory.Parent.FullName, fileInfo.Name);
}
else
{
// there is no parent folder
}
One way in Perl regex flavour. It removes last directory in the path:
s/[^\\]+\\([^\\]*)$/$1/
Explanation:
s/.../.../ # Substitute command.
[^\\]+ # Any chars until '\'
\\ # A back-slash.
([^\\]*) # Any chars until '\'
$ # End-of-line (zero-width)
$1 # Substitute all characters matched in previous expression with expression between parentheses.
You can give this a try although it is a Java Code
String original_path = "c:\\Users\\User\\Documents\\document.txt";
String temp_path = original_path.substring(0,original_path.lastIndexOf("\\"));
String temp_path_1 = temp_path.substring(0,temp_path.lastIndexOf("\\"));
String temp_path_2 = original_path.substring(original_path.lastIndexOf("\\")+1,original_path.length());
System.out.println(temp_path_1 +"\\" + temp_path_2);
You mentioned that transformation is the same every time so, it is not always a good practice to rely on regexp for things which can be done using String manipulations.
Why not some combination of pathStr.Split('\\'), Take(length - 2), and String.Join?
Use Regex replace method. Find what you are looking for, then replace it with nothing (string.empty) here is the C# code:
string directory = #"c:\Users\User\Documents\document.txt";
string pattern = #"(Documents\\)";
Console.WriteLine( Regex.Replace(directory, pattern, string.Empty ) );
// Outputs
// c:\Users\User\document.txt
I want a regex in such a way that to replace the filename which contains special characters and dots(.) etc. with underscore(_) except the extension of the filename.
Help me with an regex
try this:
([!##$%^&*()]|(?:[.](?![a-z0-9]+$)))
with the insensitive flag "i". Replace with '_'
The first lot of characters can be customised, or maybe use \W (any non-word)
so this reads as:
replace with '_' where I match and of this set, or a period that is not followed by some characters or numbers and the end of line
Sample c# code:
var newstr = new Regex("([!##$%^&*()]|(?:[.](?![a-z0-9]+$)))", RegexOptions.IgnoreCase)
.Replace(myPath, "_");
Since you only care about the extension, forget about the rest of the filename. Write a regex to scrape off the extension, discarding the original filename, and then glue that extension onto the new filename.
This regular expression will match the extension, including the dot.: \.[^.]*$
Perhaps just take off the extension first and put it back on after? Something like (but add your own list of special characters):
static readonly Regex removeChars = new Regex("[-. ]", RegexOptions.Compiled);
static void Main() {
string path = "ab c.-def.ghi";
string ext = Path.GetExtension(path);
path = Path.ChangeExtension(
removeChars.Replace(Path.ChangeExtension(path, null), "_"), ext);
}
Once you separate the file extension out from your string would this then get you the rest of the way?