I want to use simple Unicode case mapping and not the default full case mapping. The entry in http://perldoc.perl.org/perlunicode.html#User-Defined-Case-Mappings looked to be the way to go.

However a small test program 
#!/usr/bin/perl
use strict;
sub ToUpper {
  return<<END;
0061\t0063\t0044
END
print "Here we are\n";
}
my $tim = "abcdef";
my $t2 = uc($tim);
print "$t2\n";

[download]

does not give the expected result, just the normal uc output. The print statement is not executed so ToUpper is not even called.

What am I doing wrong? If anyone already has simple case mapping already implemented then that would be nice also.

In reply to User-Defined Case Mappings by timgreenwood

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