This is where your editor can help. Emacs' cperl-mode can display trailing whitespace. For example: 
print <<"EOT";
This is
a piece
of text.
EOT_

[download]
The underscore after EOT indicates a trailing space which can help a lot in this case.

Arjen

All that is gold does not glitter...

In reply to Re^3: On bad habits by Aragorn
in thread On bad habits by g0n

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