To make things even more clear (I hope), I'll just add that you can pass modifiers to qr, just like you can for normal regexes, like this: 
$re = qr/<!--.*?-->/s;
print $re;

[download]
which prints 
  (?s-xim:<!--.*?-->)

[download]
That is: /s enabled, and /x, /i and /m disabled.

In reply to Re(2): Unexpected qr// behavior by bart
in thread Unexpected qr// behavior by pbeckingham

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