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while (my $line = <$fh>) {
    chomp $line;
...
    }
    }    
}

my $rx_word = qr{ \b [[:alpha:]]+ \b }xms;  # a very naïve word!

while (my $line = <$fh>) {
    exists $count{$_} and ++$count{$_} for $line =~ m{ $rx_word }xmsg;
    }