In this case I wouldn't use '\Q' at all, since it has an effect while '\E' is quite neutral!
DB<100> $var=666
=> 666
DB<101> "$var\Efoo"
=> "666foo"
DB<102> "$var\Ef\Eoo"
=> "666foo"
Anyway the use case is restricted to interpolation like in qq{} or regex.
Curlies can be used for any variable.
Cheers Rolf
( addicted to the Perl Programming Language)
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