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import re
REPLACE_NO_SPACE = re.compile("[.;:!\'?,\"()\[\]]")
REPLACE_WITH_SPACE = re.compile("(<br\s*/><br\s*/>)|(\-)|(\/)")
def preprocess_reviews(reviews):
reviews = [REPLACE_NO_SPACE.sub("", line.lower()) for line in reviews]
reviews = [REPLACE_WITH_SPACE.sub(" ", line) for line in reviews]
return reviews
reviews_train_clean = preprocess_reviews(reviews_train)
reviews_test_clean = preprocess_reviews(reviews_test)
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