A regex isn't the right tool for the job. Since the table has fixed width, use substr or unpack to extract the cells; perlpacktut has an example.
If the width of the columns isn't known in advance, use a regex to find the column width by considering the first line, and use unpack/substr for the rest of the table.
Update: some example code. Trimming of leading/trailing whitespaces left as an exercise to the reader
use 5.010;
use strict;
use warnings;
my $head_line = <DATA>;
my @c_idx;
while ($head_line =~ /\S+/g) {
push @c_idx, $-[0];
}
my $sep = <DATA>; # ignored;
while (<DATA>) {
chomp;
my @columns;
for my $idx (0..$#c_idx) {
if ($idx == $#c_idx) {
push @columns, substr $_, $c_idx[$idx];
}
else {
push @columns, substr $_, $c_idx[$idx], $c_idx[$idx+1] - $
+c_idx[$idx];
}
}
use Data::Dumper;
print Dumper \@columns;
}
__DATA__
Mod Sub-Module Model Serial
---- --------------------------- ------------------ -----------
1 Distributed Forwarding Card WS-F6700-DFC3CXL SAL1434RLPY
3 7600 ES+ DFC XL 7600-ES+3CXL JAE14520N29
3 7600 ES+T 20x1GE SFP 76-ES+T-20GQ JAE145301XM
5 Policy Feature Card 3 7600-PFC3CXL JAE14330E6J
5 C7600 MSFC4 Daughterboard 7600-MSFC4 JAE14320QBE
6 Policy Feature Card 3 7600-PFC3CXL JAE14330EAO
6 C7600 MSFC4 Daughterboard 7600-MSFC4 JAE14320QA8
7 Distributed Forwarding Card WS-F6700-DFC3CXL SAL1433QHBR
8 Distributed Forwarding Card WS-F6700-DFC3CXL SAL1433QXF9
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