How about looking for the following:

  Project : error PRJ0019
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although using a regular expresson to do it, such as:

  if ($totalOutput =~ /^Project : error (\w+)/)
  {
    my $project = $1;
    ...
  }
[download]

(or better), as that seems to also be a good indicator of which project failed. Or is it more complex than that?