javascript obfuscating problem

check this out:   http://www.jasondavies.com/unicode.js

I got it from http://www.jasondavies.com/wordcloud/#%2F%2Fwww.jasondavies.com%2Fwordtree%2Fcat-in-the-hat.txt

Following the code trail, I see the unicode javascript has to do with regex.  It looks like the code is obfuscated to the max.

1. I did not know that you can hide code in javascript.  How is this done?

2. how can I undo it to see the regex?

Thanks.

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