Sounds like you forgot to use utf8::upgrade($from);

No, I tried this: 

#!/usr/bin/perl

$Lang{$L}{"Repl"} = { "m" => "Monat" };  # mimic Date::Manip
$_ = "Mär";

print "before: $_\n";

foreach $from (keys %{ $Lang{$L}{"Repl"} }) {
  $to=$Lang{$L}{"Repl"}{$from};

  utf8::upgrade($from);  # Use Unicode semantics
  s/(^|[^[:alpha:]])$from($|[^[:alpha:]])/$1$to$2/i;
}    
print "after:  $_\n";

[download]

which prints 

before: Mär
after:  Monatär

[download]

Using 

  s/(^|[^\p{IsAlpha}])$from($|[^\p{IsAlpha}])/$1$to$2/i;

[download]

in place of the above substitution does work fine, though (as does adding use locale to the [:alpha:] version): 

before: Mär
after:  Mär

[download]

presuming other changes will be made as well
No, using unicode semantics is enough.

I was referring to "MÄR" also working (in addition to "Mär") in the context of Date::Manip...  which it won't unless that abbreviation is also being set up in the respective $$d{"month_abb"}=...

In reply to Re^6: Date::Manip and German months names (solved) by almut
in thread Date::Manip and German months names by almut

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