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Regex...extract filename

Posted on 2003-12-10
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Last Modified: 2009-07-29
I always think I understand regex's until I go to use them. I'm using C# and .NET Framework.   Let's say I have the following string:

"C:\\MsDev\\Sharp\\bin\\Debug\\Control.dll`~`3`~`0`~`"    notice that `~` is my delimiter

I want to extract the filename from the string using regex.

I think the following snippet should work, but it is assigning 'filename' with the entire string, not just the filename.  Any ideas??  Thanks in advance.

//Get the filename from string using regex...
string filename = (Regex.Replace(dataString, "^(.*)(`~`)?", "$1")).ToString();
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Question by:GorGor1
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8 Comments
 
LVL 9

Expert Comment

by:msdixon
ID: 9914961
System.IO.Path.GetFileName(file); // where file is the full path and file name
0
 
LVL 1

Author Comment

by:GorGor1
ID: 9914994
How does that work??  How is that going to extract the filename from my `~` delimited string??
0
 
LVL 20

Accepted Solution

by:
TheAvenger earned 50 total points
ID: 9915102
Is it obligatory to use regex? You can use this:

int delPos = dataString.IndexOf ("'~'");
string filename = dataString.Substring (0, delPos);
filename = filename.Substring (filename.LastIndexOf ("\\") + 1);
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LVL 1

Author Comment

by:GorGor1
ID: 9915143
I'd much rather use regex.  The string is actually much much longer than what I posted here and I'm using regex to remove and read elements of the string, etc.

Long story short, using Regex.Replace(...) makes the most sense in my particular case.
0
 
LVL 20

Expert Comment

by:TheAvenger
ID: 9915668
OK, this one works in your case:

string dataString = "C:\\MsDev\\Sharp\\bin\\Debug\\Control.dll'~'3'~'0'~'";
string pattern = "(?:[\\w\\\\:]*)(?:\\\\)([^\\\\']*).*";
string filename = (Regex.Replace(dataString, pattern, "$1")).ToString();
MessageBox.Show (filename);
0
 
LVL 1

Author Comment

by:GorGor1
ID: 9916659
Thanks, it works great!  Turns out that I like your other solution better.  It's definitely a much cleaner approach.  Thanks again.
0
 
LVL 9

Expert Comment

by:msdixon
ID: 9917103
so how is that any easier than using the Path.GetFileName method? it seems like a lot more work to me.
0
 
LVL 20

Expert Comment

by:TheAvenger
ID: 9918693
He has the file path in a string variable among other data and wants to extract it. Path.GetFileName will give you the path of a pysically existing file which is absolutely different
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