extracting file name from long string

Posted on 2011-02-24
Last Modified: 2012-05-11
What's best way in regex to extract the file name from the below format of a string

2011-02-22 17:49:42 ....A         7114         1088  ErrE\CC\RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps

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Question by:NewtonianB
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Accepted Solution

4runnerfun earned 125 total points
ID: 34971514
Without RegEx, you could split your string with "\" and then use the last index which would contain your filename.
LVL 33

Assisted Solution

by:Todd Gerbert
Todd Gerbert earned 125 total points
ID: 34971545
That text looks like output of a "dir" or something - which means the filename should always start at the nth position, so you could use String.Substring. Or if the file name never contains spaces, find start of file name with LastIndexOf.

Author Comment

ID: 34971813
4runnerfun: sometimes there is no path it is just the file name thats why regex provides most flexibility for me

tgerbert: there could be spaces in the path
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Author Comment

ID: 34972001
basically all i know is that it will end with  .fps and I need to find the filename (lets actually assume there could be no space in the path or filename)

wether its

2011-02-22 17:49:42 ....A         7114         1088  ErrE\CC\RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps


2011-02-22 17:49:42 ....A         7114         1088  RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps

I need it to output
LVL 33

Expert Comment

by:Todd Gerbert
ID: 34972626
Assuming the path/file always starts at the 54th character (and I would guess that it does):
string input = @"2011-02-22 17:49:42 ....A         7114         1088  ErrE\CC\RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps";
string fileName = System.IO.Path.GetFileName(input.Substring(53));

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Or, to go from the right-most space to the end of the line:
string input = @"2011-02-22 17:49:42 ....A         7114         1088  ErrE\CC\RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps";
string fileName = System.IO.Path.GetFileName(input.Substring(input.LastIndexOf(' ') + 1));

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LVL 63

Assisted Solution

by:Fernando Soto
Fernando Soto earned 125 total points
ID: 34972720
Hi NewtonianB;

The code in the code snippet should do what you need using Regular Expression.

using System.Text.RegularExpressions;

string testInput = @"2011-02-22 17:49:42 ....A         7114         1088  ErrE\CC\RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps" + "\n" +
    @"2011-02-22 17:49:42 ....A         7114         1088  RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps";

string pattern = @"(\b[^\s]+\.fps\b)";

MatchCollection mc = Regex.Matches(testInput, pattern);

foreach(Match m in mc)

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LVL 11

Assisted Solution

by:Sudhakar Pulivarthi
Sudhakar Pulivarthi earned 125 total points
ID: 34978604
FernandoSoto: solution was good to regex, but it gives the file path when there is any path provided in the source string so its good to add one more line of code to get file name always.

string fileName = null;
string pattern = @"(\b[^\s]+\.fps\b)";
string b=@"2011-02-22 17:49:42 ....A         7114         1088  ErrE\C C\RM-004_2011.05_01.02_49u.2011.04_rnd.logform3.fps";
 MatchCollection mc = Regex.Matches(b, pattern);
if (mc.Count == 1)
fileName = Path.GetFileName(mc[0].Value); // This will return the file name only even when path is matched
LVL 33

Expert Comment

by:Todd Gerbert
ID: 34982482
I think you'd want that regular expression to end with "$", e.g. "\b\S+\.fps$", it is possible for a character matching word-boundary to appear in the middle of the filename.

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