Yes, in such a case, you want to declare the array before entering the loop. That's what choroba is doing in the suggested code, declaring @found right before entering the loop:
my @found;
sub findstuff {
my $file = $_;
return unless -f $file;
my $fullpath = $File::Find::name;
if (fgrep(qr/regex/, $file)) {
push @found, $fullpath;
}
}
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