In case you want the keys to include meta-characters that you don't want to treat as such, you might want to "protect" them:
#!/usr/bin/perl -w
use strict;
my %changes=( foo => 'toto',
bar => 'tata',
'fo*' => 'to*',
);
my $changeList = join('|', map { "\Q$_\E"} keys %changes);
my $string= "foo bar fo*";
$string =~ s/($changeList)/$changes{$1}/g;
print $string;
This way $changeList looks like (\Qkey1\E|\Qkey2|...), which instructs the regexp engine to treat everything between \Q and \E as a literal.
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