my @out = map { s/'/"/g; $_ } @in;

This solution has the behavior discussed by duff here and here of also changing the source array:

c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"my @in  = ('Maria-s', 'Thano-s');
 my @out = map { s/-/+/g;  $_; } @in;
 print Dumper \@in;
 print Dumper \@out;
"
$VAR1 = [
          'Maria+s',
          'Thano+s'
        ];

$VAR1 = [
          'Maria+s',
          'Thano+s'
        ];
[download]

If this is acceptable, I would rather just get it over with and change (and henceforth use) the source with a for-loop (rather than a map built-in: for clarity):

c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"my @in = ('Maria-s', 'Thano-s');
 s/-/+/g for @in;
 print Dumper \@in;
"
$VAR1 = [
          'Maria+s',
          'Thano+s'
        ];
[download]

Prior to Perl version 5.14, aliased substitution can be avoided by substitution-on-assignment:

c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"print 'perl version: ', $];
 ;;
 my @in  = ('Maria-s', 'Thano-s');
 my @out = map { (my $mp = $_) =~ s/-/+/g;  $mp; } @in;
 print Dumper \@in;
 print Dumper \@out;
"
perl version: 5.008009
$VAR1 = [
          'Maria-s',
          'Thano-s'
        ];

$VAR1 = [
          'Maria+s',
          'Thano+s'
        ];
[download]

With version 5.14+, the  /r substitution modifier can be used:

c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"print 'perl version: ', $];
 ;;
 my @in  = ('Maria-s', 'Thano-s');
 my @out = map { s/-/+/gr } @in;
 print Dumper \@in;
 print Dumper \@out;
"
perl version: 5.014004
$VAR1 = [
          'Maria-s',
          'Thano-s'
        ];

$VAR1 = [
          'Maria+s',
          'Thano+s'
        ];
[download]

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