Perl Learning - 15 (s///)
/U changes all characters after it to upper case; /L changes all characters after it to lower case;/E close the window of /U or /L;
/u changes one character after it to upper case;
/l changes one character after it to loser case;
/u/L changes one character after it to upper case and all other characters to lower case;
/l/U changes one character after it to lower case and all other characters to upper case.
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