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        $html =~ s/foo/bar/;
        $html =~ s/baz/quux/;
        $html =~ s/monkey/pants/;

        $html =~ s/foo/bar/;
        
...
        }
        
        $html =~ s/monkey/pants/;

        $replacements =
            [
                ['foo','bar'],
                ['baz','quux']
            ];

        $replacements =
            {  
                fix_foo => ['foo','bar'],
                fix_baz => ['baz','quux']
            };