TIMTOWDI, but I would suggest you replace: 
 my $data;
open my $FH, '<' , $config or die "Cannot open $config: $!\n";
local $/ = undef;
s/^\s*#.*\n|^\n//gm for $data = <$FH>;

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with 
open my $FH, '<' , $config or die "Cannot open $config: $!\n";
local $/ = undef;
my $data = <$FH>;
 $data =~ s/^\s*#.*\n|^\n//gm;

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The use of the for loop on a value you expect to be scalar confuses casual perusal, and you've declared the variable (my) at a different spot than where you initialize it. If you want to go compound, there's always 
(my $data = <$FH>) =~ s/^\s*#.*\n|^\n//gm;

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but that feels crowded to me. If I were actually writing this, I would do: 
my $data = do {
    local $/ = undef;
    open my $FH, '<' , $config or die "Cannot open $config: $!\n";
    <$FH>;
};
$data =~ s/^\s*#.*\n|^\n//gm;

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Slurping in a do loop keeps the filehandle tightly scoped and keeps that localization of the input file separator actually local. And note, even then, I personally prefer keeping the processing separate from the import.

Update: Fixed typos; haukex++

Update: Fixed typos; haukex++. Some days you just shouldn't post code.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^2: Match pattern per line and after another one as multiline in single file opening by kennethk
in thread Match pattern per line and after another one as multiline in single file opening by Yakup

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