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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