or download this
> grep -B2 -A5 -h 'X<qr>' /usr/share/perl/5.10/pod/*.pod
=head2 Quote and Quote-like Operators
...
/PATTERN/msixpogc, ?PATTERN? X<?>, s/PATTERN/REPLACEMENT/msixpogce
X<substitute> X<substitution> X<replace> X<regexp, replace> X<regexp,
substitute> X</m> X</s> X</i> X</x> X</p> X</o> X</g> X</c> X</e>