use strict;
use warnings;
use Parse::RecDescent;
$::RD_HINT=5;

my $grammar = <<'GRAMMAR';
  { 
    use strict;
    use warnings;
  }     
          
  logfile : 'e:\\logfiles\\' /[-A-Za-z0-9_.]+/ 
            { $item[2] }
  
  date : 
    m{
        (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)
        \s
        \d\d
        (?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)
        \d\d
    }x
  
  time  : /\d{2}:\d{2}:\d{2}/ 

  sentfile: 
    <skip:''>
    'd:\\data\\'
    /[-A-Za-z0-9_]+/
    '.dat'
    { $item[3] }

  
  rate  : /\d+\.\d [A-Za-z]+\/sec/
  
  bytecount : /\d+ bytes/
  
  parse : 
    logfile 
    /\[\d+\]/
    date
    time
    /- \(\d+\) Sent file /
    sentfile
    <skip:'[- \t()]*'> (
        /successfully/
        rate
    )
    bytecount
  { [ @item{qw(logfile date time sentfile bytecount)}] }


GRAMMAR
# Expect: beardstownbase,Thu 22Jun06 08:07:19,58bn5904,859216 bytes
my $parser = Parse::RecDescent->new($grammar);
use Data::Dumper;
while (my $line = <DATA>) {
    last unless $line =~ /\S/;

    my @fields = $parser->parse($line);
    if (@fields) {
        print Dumper \@fields;
    }

}

__DATA__
e:\logfiles\beardstownbase.log [3] Thu 22Jun06 08:07:19 - (006415) Sent file d:\data\58bn5904.dat successfully (25.0 Kb/se