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I need to do exactly the opposite of Replacing a & in XML correctly?.

This is because I want to make human-readable some XML that I get from a log. Thus, I'd like to use xmllint --format, but it complains about how "&","<", ">" and the like are encoded.

I am going to do this on MacOS and perl is available.

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As you've mentioned perl, XML::Entities will do what you want. Example:

 use XML::Entities;
 $a = "Tom &amp; Jerry &copy; Warner Bros&period;";
 $b = XML::Entities::decode('all', $a);

$b Will be the string "Tom & Jerry © Warner Bros."

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