Both \Q and \ will escape @

No, \Q doesn't: 

$ perl -wle'print q{@@x} =~ m|\A\Q@@x\E\z| ? "match" : "no match"'
Possible unintended interpolation of @x in string at -e line 1.
Name "main::x" used only once: possible typo at -e line 1.
no match

$ perl -wle'print q{@@x} =~ m|\A@\@x\z| ? "match" : "no match"'
match

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In reply to Re^2: regular expression with @@/ by almut
in thread regular expression with @@/ by jim_neophyte

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