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my ($current_date) = map { qr/$_/ } (scalar localtime) =~ /\w+ +(\w+ +
+\d+)/;

my @errors = map {qr/$_/} qw( error4 error3 error2 error1 );

open my $LOGFILE, '<', $log_file
  or die "can not open $log_file for writing: $!\n";

$w = 1;
while ($w <= @word_search) {
    # uses $w - 1 to get $word_search[$w - 1]
    $w++;
}

foreach my $w ( 0 .. $#word_search ) {
    # uses $w to get $word_search[$w]
}

if ($word_search[$w-1] eq $pattern_date && $word_search[$w-1] eq $arra
+y[$count])

if ( $line =~ /$current_date/ ) {
    foreach my $error (@errors) {
...
        ++$error_count while ($line =~ /($error)/g);
    }
}