CODEWITHSUNDEEP
c#regex
Izzy
Izzy

Reputation: 6866

Removing parts of the path from string

Consider the following string 

string path = @"\\ParentDirectory\All_Attachments$\BATCH_NUMBERS\TS0001\SubDirectory\FileName.txt";

I am trying to modify the path by removing the \\ParentDirectory\All_Attachments$\. So I want my final string to look like:

BATCH_NUMBERS\TS0001\SubDirectory\FileName.txt

I have come up with the following regex

string pattern = @"(?<=\$)(\\)";

string returnValue = Regex.Replace(path, pattern, "", RegexOptions.IgnoreCase);

With the above if I do Console.WriteLine(returnValue) I get 

\\ParentDirectory\All_Attachments$BATCH_NUMBERS\TS0001\SubDirectory\FileName.txt

So it only removes \ can someone tell me how to achieve this please.

Upvotes: 0

Views: 1080

Answers (4)

Leon Barkan
Leon Barkan

Reputation: 2703

You can use a combination of Substring() and IndexOf() to accomplish your goal:

string result = path.Substring(path.IndexOf("$") + 1);

Upvotes: 0

LukStorms
LukStorms

Reputation: 29647

Using a regex that takes the first 2 groups of (backslash(es) followed by 1 or more non-backslashes). And including the $ and backslash after that. 

string returnValue = Regex.Replace(path, @"^(?:\\+[^\\]+){2}\$\\", "");

Or by splitting on $, joining the string array without it's first element and then trim \ from the start:

string returnValue = string.Join(null, path.Split('$').Skip(1)).TrimStart('\\');

But you'll be using System.Linq for that method to work.

Upvotes: 0

Alex K.
Alex K.

Reputation: 175766

As an alternative avoiding an RE or split/join you could just run along the string until you have seen 4 slashes:

string result = null;
for (int i = 0, m = 0; i < path.Length; i++)
    if (path[i] == '\\' && ++m == 4) {
        result = path.Substring(i + 1);
        break;
    }

Upvotes: 0

RePierre
RePierre

Reputation: 9566

The code below should do the trick.

string path = @"\\ParentDirectory\All_Attachments$\BATCH_NUMBERS\TS0001\SubDirectory\FileName.txt";
var result = Regex.Replace(path, 
@"^      # Start of string
[^$]+    # Anything that is not '$' at least one time
\$       # The '$ sign
\\       # The \ after the '$'
", String.Empty, RegexOptions.IgnorePatternWhitespace);

When executed in LinqPad it gives the following result:

BATCH_NUMBERS\TS0001\SubDirectory\FileName.txt

Upvotes: 2

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