#! /usr/bin/env perl
use strict;
use warnings;
use utf8;
use 5.14.0;

binmode(STDOUT, ':utf8');

my $str = 'Wölle';
say "Original: $str";

$str =~ s/[éè]/e/g;
say "after s/e/e/: $str";

$str =~ s/[öÖ]/oe/g;
say "after s/ö/oe/: $str";