Also lowercase NOT

Author: turian

Diff for: retrieve-sentences.py

@@ -39,6 +39,7 @@ def retrieve(querytext, searcher, queryparser, maxresults=1000):
 #    querytext = querytext.replace("OR AND", "or and")
     querytext = querytext.replace("OR", "or")
     querytext = querytext.replace("AND", "and")
+    querytext = querytext.replace("NOT", "not")
     query = queryparser.parse(queryparser.escape(querytext))
 #    query = QueryParser(analyzer).parse("Find this sentence please")
     hits = searcher.search(query, maxresults)