Dear Perl Experts,
I am not sure how to loop through tr.../tr and produce this required output:

<input>
<tr><tc>1</tc><tc>2</tc><tc>3</tc></tr>
<tr><tc colspan="2">1and2</tc><tc>3</tc></tr>
<tr><tc>1</tc><tc colspan="2">2and3</tc></tr>
<tr><tc>1</tc><tc>2</tc><tc>3</tc></tr>
[download]

<RequiredOutput>
<tr><tc cNum="1">1</tc><tc cNum="2">2</tc><tc cNum="3">3</tc></tr>
<tr><tc cNum="1" colspan="2">1and2</tc><tc cNum="3">3</tc></tr>
<tr><tc cNum="1">1</tc><tc cNum="2" colspan="2">2and3</tc></tr>
<tr><tc cNum="1">1</tc><tc cNum="2">2</tc><tc cNum="3">3</tc></tr>
[download]

My present code produces wrong output:

#!/usr/bin/perl
open(IN, "<data.in") or die ("inFile not found -- $!\n");
open(OUT, ">data.out") or die ("outFile not found -- $!\n");

while(<IN>)
{
    local $/='<tr>';
    my $cnt=0;
    while(/<tc>/){
        s!<tc>!'<tc cNum="'.++$cnt.'">'!ie;
    }
    print OUT;
}

close(IN);
close(OUT);
[download]

e.g. in the 2nd row, I am not sure how to increment the column Number cNum based on the previous column span's value.

Please give me some tips.

Thanks in advance.

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