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glob and regex

DoolinDalton
Novice

Sep 24, 2009, 2:41 PM

Post #1 of 4 (7355 views)

glob and regex	Can't Post

I have the following very simple code.

@files = glob("C:\\test\\*");
$file_count = @files;
print $file_count;

As you can see, I am globbing everything in the directory C:\test and printing the count of the files. How do I utilize regex to modify the parameter of the glob so that...

(1) I exclude any files that containt the underscore character ( "_" )
(2) But include certain specific files that have the underscore character.

For example, if the file list in the directory was

file1.txt
file_2.txt
file3.txt
include_this_file.txt

Then I want to print 3. (Eventhough the last file has the underscore character, I want to include this in the glob.)

I would guess, somewhere in the regex I would need to hard code the files I want, in this case, the file called include_this_file.txt.

(This post was edited by DoolinDalton on Sep 24, 2009, 2:43 PM)

toolic
User

Sep 24, 2009, 4:44 PM

Post #2 of 4 (7347 views)

Re: [DoolinDalton] glob and regex [In reply to]	Can't Post

To satisfy your 1st requirement, you could use grep to
filter out files with underscores:

Code

@files = grep { ! /_/ } glob("C:\\test\\*");

You need to refine your 2nd requirement
since it contradicts your 1st requirement.

You might be able to wedge something like this
into a grep as well:

Code

@files = glob("C:\\test\\*"); 
@keeps; 
for (@files) { 
    if (($_ eq 'include_file.txt') or (!/_/) ){ 
        push @keeps $_; 
    } 
}

Since glob will also return subdirectoires, you may
also want to grab just files using -f:

Code

@files = grep { -f and (! /_/) } glob("C:\\test\\*");

(This post was edited by toolic on Sep 24, 2009, 4:52 PM)

shawnhcorey
Enthusiast

Sep 24, 2009, 4:51 PM

Post #3 of 4 (7346 views)

Re: [DoolinDalton] glob and regex [In reply to]	Can't Post

In Reply To

For example, if the file list in the directory was

file1.txt
file_2.txt
file3.txt
include_this_file.txt

Then I want to print 3. (Eventhough the last file has the underscore character, I want to include this in the glob.)

I would guess, somewhere in the regex I would need to hard code the files I want, in this case, the file called include_this_file.txt.

I wouldn't try to do it with one complex expression but expand it out:

Code

#!/usr/bin/perl 
 
use strict; 
use warnings; 
 
my @Valid_files = qw( include_this_file.txt ); 
my $file_count = 0; 
 
for my $file ( glob( "C::\\test\\*" ) ){ 
  if( $file =~ /_/ ){ 
    for my $valid_file ( @Valid_files ){ 
      if( $file =~ /\Q$valid_file\E$/ ){ 
        $file_count ++; 
        last; 
      } 
    } 
  }else{ 
    $file_count ++; 
  } 
} 
 
print "file count = $file_count\n";

__END__

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DoolinDalton
Novice

Sep 25, 2009, 11:59 AM

Post #4 of 4 (7319 views)

Re: [shawnhcorey] glob and regex [In reply to]	Can't Post

Thank you for the ideas.

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