Lexical Analysis Libraries
2 answers
This field is called natural language processing, and it's an incredibly tricky question - you don't just need to parse words that are positive / negative, but you also need to parse modifiers (like "Something is wrong").
As usual, Wikipedia contains some information. If you've just played around a bit with this, I suggest trying a simple system (for example, recognizing "good" and "bad" and "no") and create one.
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