Re^2: Looking for ways to speed up the parsing of a file...

The OP also wants to test if the text following the colon is a numeric value or something else. It still can be done with one regex, though:

if (/^\s+total wire length\:\s+(\d.*\d)?/) {
  if (defined($1)) {
    $NetLength = $1;
    $c++;
  } else {
    $NetLength = "NaN";
  }
}
[download]

Comment on Re^2: Looking for ways to speed up the parsing of a file... Download Code