str.tr("^a", "z") $B$H$7$?>l9g$K!"(Bstr $B$,(B "a" $B$J$i(B "z"
$B$K$J$k$N(B
$B$K!"(B"aa" $B$J$i(B "aa"
$B$N$^$^$K$J$k$N$OJQ$G$O$J$$$G$7$g$&$+!#(B
% ./ruby -ve 'p "a".tr("^a", "z")'
ruby 1.9.0 (2008-05-10 revision 16347) [i686-linux]
"z"
% ./ruby -ve 'p "aa".tr("^a", "z")'
ruby 1.9.0 (2008-05-10 revision 16347) [i686-linux]
"aa"
on 10.05.2008 15:41