while ($firstrow =~ /(<\w>)/g) {
    push @columnpos, pos($firstrow) - length($1);
}

[download]

You could use a look-ahead to avoid doing the capture, length and subtraction.

push @columnpos, pos $firstrow while $firstrow =~ m{(?=<\w>)}g;

[download]

I hope this is of interest.

Cheers,

JohnGG

In reply to Re^2: How to find start position of each column by johngg
in thread How to find start position of each column by Gangabass

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