limner:

At first, I was wondering why you were having trouble, as HTML::TableExtract pulls all the data into a structure for you. Then I tried whipping up a simple example, and found that I couldn't edit the data in-place, as I expected to be able to.

To get around that, I simply made a temporary array to hold the data. From there I could manipulate the data and do whatever with it:

# Copy all the data from the table into @tbl
my @tbl;
push @tbl, [ @$_ ] for $table->rows;

# Now edit the data any way you like:
for my $r (0 .. $#tbl) {
    # Make the first column ALL UPPERCASE
    $data[$r][0] =~ tr/a-z/A-Z/;

    ... more editing, as desired ...
}

# print it
for my $rox (@tbl) {
    print join(";", @$rox), "\n";
}
[download]

...roboticus

When your only tool is a hammer, all problems look like your thumb.