This operator quotes (and possibly compiles) its STRING as a regular expression. STRING is interpolated the same way as PATTERN in m/PATTERN/. If "'" is used as the delimiter, no interpolation is done. Returns a Perl value which may be used instead of the corresponding /STRING/msixpo expression. The returned value is a normalized version of the original pattern. It magically differs from a string containing the same characters: ref(qr/x/) returns "Regexp", even though dereferencing the result returns undef.
I think the relevant part of the docs is the bit I've highlighted. qr//
compiles normalises the regex--which basically means blessing it. Hence the magical behaviour.
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