if ($line =~ /^0.{9}(\t\d{1,20}){49}/)  {

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Will do the same as your lengthy regex, except, that it doesn't grep all the individual numbers.

OTOH our REs won't match the line at all. I think, this one will serve the purpose better 
if (/^0[0-9a-fA-F]{9}(?:\t[\d\.]{1,20}){49}/ {

[download]
Okay: This will also match (e.g.) IP Adresses, as i doesn't take into account, that a number may only contain 1 decimal point, but maybe it's okay. You're the only one who can tell.
$\=~s;s*.*;q^|D9JYJ^^qq^\//\\\///^;ex;print

In reply to Re: Regex problem by Skeeve
in thread Regex problem by Win

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