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my $in_file = "$logfile";
open my $in_fh, '<', $in_file or die "Could not open file $in_file: $!
++";
...
close $in_fh  or die "Could not close file $in_file: $!";
close $out_fh or die "Could not close file $out_file: $!";

C:\code>perl -wc a.pl
syntax error at a.pl line 37, near "/^(\d\d\d\d-\w\w\w-\d\d \d\d)/)"
a.pl had compilation errors.