Hi Monks,

I have a function with should select files by a given list of extension. I wrote a program, which did not work. After playing a little around I found a working solution (using a local variable: my $x). But I do not understand, why my first version is not working.

Can you help me explaining the difference between this two versions:

In the first version the expression(@ext) is replaces by '1';

In the second version the expression(@ext) is correct. ('f.*\\.txt$', 'f.*\\.txt.*$')

Thanks for your help !!!

use strict;
use warnings;
use Data::Dumper qw(Dumper);
$\="\n"; 

my @ext;
my @list=('f1.txt','f2.txtx','f3.xtxt','x1.txt');
my  $ex="f*.txt,f*.txt*";

print " Version 1: Not working--------------------------------";
@ext=map { $_=quotemeta($_).'$'; s/\\\*/.*/;} split(/,/,$ex);         
+  # <<<<<< compare this line
print "qr=".Dumper(\@ext);
foreach my $e(@ext)
{ foreach my $f(@list) {print "Match: ($e) => $f" if ($f=~m/$e/); }}

print " Version 2: working--------------------------------";
@ext=map { my $x=quotemeta($_).'$'; $x=~s/\\\*/.*/g; $_=$x;} split(/,/
+,$ex);  # <<<<<< compare this line
print "qr=".Dumper(\@ext);
foreach my $e(@ext)
{ foreach my $f(@list) {print "Match: ($e) => $f" if ($f=~m/$e/); }}
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