hi, thanks for your time and help
but the code 
while (<IN>) {
   s{(<tgroup cols="(.*?)">)}{
      "$1\n" .
      (map { "<colspec colnum='$_' colname='$_'/>\n" } 1..$2)
   }eg;
   print OUT;
}

[download]
just prints <table><tgroup cols="3">3</table>

In reply to Re^2: for loop by texuser74
in thread for loop by texuser74

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