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