lanx@nc10-ubuntu:/tmp$ grep 'X<qr>' perlop.pod
X<qr> X<s> X<tr> X<'> X<''> X<"> X<""> X<//> X<`> X<``> X<<< << >>>
X<qr> X</i> X</m> X</o> X</s> X</x> X</p>

##</code><code>##

lanx@nc10-ubuntu:/tmp$ grep 'Xref' perlop.man |grep qr
.IX Xref "operator, quote operator, quote-like q qq qx qw m qr s tr ' '' "" """" ` `` << escape sequence escape"
.IX Xref "qr  i  m  o  s  x  p"