in reply to Re^2: Here documents in blocks
in thread Here documents in blocks

> If the same trick is attempted with a print statement, Perl complains that we Can't modify print in substitution (s///).

That's why the /r flag was introduced. try s///r

update

print <<"HEREDOC" =~ s/^\s+//gmr;      # <-  works
    your text
    goes here
HEREDOC
__END__
your text
goes here

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Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In Section Seekers of Perl Wisdom