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#!/usr/bin/perl -ws
use Parse::RecDescent;
undef $::RD_WARN;
my $parse = Parse::RecDescent->new(<<'EOGRAMMAR');
{use Tie::Hash; }
line: <rulevar: local %max; tie %max, Tie::StdHash'; %max = (count=>0) >
line: seplist[sep=>',']
| seplist[sep=>':']
| seplist[sep=>" "]
| { $max{item} }
seplist: <skip:"">
<leftop: /[^$arg{sep}]*/ "$arg{sep}" /[^$arg{sep}]*/>
{ $max{count} = @{$max{item} = $item[2]}
if @{$item[2]} > $max{count};
}
<reject>
EOGRAMMAR
while (<DATA>)
{
chomp;
my $res = $parse->line($_);
print '[', join('][', @$res), "]\n";
}
__DATA__
c,o,m,m,a,s,e,p,a,r,a,t,e,d
c:o:l:o:n:s:e:p:a:r:a:t:e:d
s p a c e s e p a r a t e d
m u:l t i,s:ep ar:a,ted
m u:l,t i,s:ep ar:a,ted
m:u:l,t i,s:ep ar:a,ted