I'm not sure this is of any use but I'll offer it anyway. The idea is to create a mask of codes which is then used to select the correct regex for that column.
#!perl
use strict;
my %REGEX = (
'A' => qr'^[A-Z]\d\d$',
'N' => qr'^[0-9]+$',
'N3' => qr'^[0-3]+$',
'D' => qr'^\d+\.\d+$',
);
my @p = qw(A N N N3 D D D D D D);
while (<DATA>){
chomp;
my @f = split '\s+';
my $chk = 'OK ';
for my $i (0..$#f){
if ($f[$i] !~ $REGEX{$p[$i]}){
$chk = 'ERR';
$f[$i] = '**'.$f[$i]." $REGEX{$p[$i]}**";
}
}
print join ' ',$chk,@f,"\n";
}
__DATA__
C3 6 3 2.4 1.5 2.6
C32 2 7 3 1.0
H31 1 1 0 21.0 11.2 5.3 1.4
T11 2 1 0 6.0 1.1 2.2
L06 1 1 0 1.0 3.3
L06 1 4 0 1.1 1.8
poj