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\t          tab                   (HT, TAB)
\n          newline               (LF, NL)
\r          return                (CR)
...
\U          uppercase till \E (think vi)
\E          end case modification (think vi)
\Q          quote (disable) pattern metacharacters till \E

my $f = 2;
print qr/$f/,"\n"; # (?-xism:2)
print qr'$f',"\n"; # (?-xism:$f)