The following eg. code will substitute the '%fixers' hash key with corresponding value from '$text'.
#!/usr/bin/perl -w
use strict;
my %fixers=(
'amazon.com' => 'danube.com',
'ibm.com' => 'bm.com',
);
my $text = qq(
Blah <a href="http://amazon.com/foo">one</a>
<a href="http://ebay.com/foo">two</a>
);
map {
$text =~ s/$_/$fixers{$_}/;
}keys %fixers;
print $text;
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