[RESOLVED] Regex help

[softwareguy74]

I've got a string such as:

"3;#bctest/Lists/Test List 1/Folder 1\"

I want to use Regex to extract that last folder, in this case: "Folder 1"

So essentially, I need to always extract the string immediately after the last forward slash (/), without including the last backslash (\). It's important to note that the string can contain any number of forward slashes, but I'm only interested in the last forward slash.

Any help would be appreciated.

[kfcSmitty]

I typically try to avoid regex in every case possible.

Is there a reason you wouldn't do something like this?

string text = "3;#bctest/Lists/Test List 1/Folder 1\\";
 
//split it by the forward slash /
string[] folders = text.Split('/');
 
//show the last element of the array and replace the backslash with blank
MessageBox.Show(folders[folders.Length - 1].Replace("\\", ""));

[softwareguy74]

The issue is efficiency. What I didn't say is that this is in a loop with potentially hundreds or thousands of these. I need the most efficient method possible. What is more efficient? RegEx or the example you provided?

[kfcSmitty]

Regex is notoriously slow. Unfortunately I am not that good at regex, but I did tweak my example a bit.

This example

string text = @"3;#bctest/Lists/Test List 1/Folder 1\";
 
int start = text.LastIndexOf('/') + 1;
int end = text.LastIndexOf('\\');
 
string test = text.Substring(start, end - start);

Runs 1,000,000 times in 0.074 seconds

[softwareguy74]

That seems to do the trick. Thanks!