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I have a question about this piece of a program:

from sklearn.feature_extraction.text import CountVectorizer, TfidfTransformer, ENGLISH_STOP_WORDS

pattern ='(?u)\\b[A-Za-z]{3,}'

stop_words = set(list(ENGLISH_STOP_WORDS) + ['test'])

cv = CountVectorizer(token_pattern=pattern, stop_words=stop_words, ngram_range=(1, 2))

what does (?u)\\b stand for? I have tried to delete it but nothing is changed

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