natural language processing

A Simple Algorithm for Identifying Negated Findings and Diseases in Discharge Summaries
We developed a simple regular expression algorithm called NegEx that implements several phrases indicating negation, filters out sentences containing phrases that falsely appear to be negation phrases, and limits the scope of the negation phrases.
Wendy W. Chapman, Will Bridewell, Paul Hanbury, Gregory F. Cooper, Bruce G. Buchanan
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NegEx
Addressing the challenge of extracting negated terms from medical records.