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From perldoc perlop:
qw/STRING/ Evaluates to a list of the words extracted out of STRING, using embedd +ed whitespace as the word delimiters. --removed by me you can see the rest in perldoc perlop-- A common mistake is to try to separate the words with comma or to put +comments into a multi-line qw-string. For this reason, the use warnin +gs pragma and the -w switch (that is, the $^W variable) produces warn +ings if the STRING contains the ``,'' or the ``#'' character.
As you can see placing placing comments in qw() is a common mistake ;) when in doubt always read the docs, and always use warnings; use strict;.

In reply to Re: Explain comments in qw// quoted data by mulander
in thread Explain comments in qw// quoted data by jesuashok

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