=over =item uc EXPR X X X =item uc Returns an uppercased version of EXPR. If EXPR is omitted, uses L|perlvar/$_>. my $str = uc("Perl is GREAT"); # "PERL IS GREAT" This function behaves the same way under various pragmas, such as in a locale, as L|/lc EXPR> does. If you want titlecase mapping on initial letters see L|/ucfirst EXPR> instead. B This is the internal function implementing the L|perlop/"Quote and Quote-like Operators"> escape in double-quoted strings. my $str = "Perl is \Ugreat\E"; # "Perl is GREAT" =back