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CHAPTER Regular Expressions, Text Normalization, Edit Distance

Speech and Language Processing. Daniel Jurafsky & James H. Martin. Copyright 2021. Allrights reserved. Draft of December 29, ,TextNormalization, Edit DistanceUser: I am : DO YOU THINK COMING HERE WILL HELP YOU NOT TO BE UNHAPPYUser: I need some help, that much seems : WHAT WOULD IT MEAN TO YOU IF YOU GOT SOME HELPUser: Perhaps I could learn to get along with my : TELL ME MORE ABOUT YOUR FAMILYUser: My mother takes care of : WHO ELSE IN YOU FAMILY TAKES CARE OF YOUUser: My : YOUR FATHERUser: You are like my father in some (1966)The dialogue above is fromELIZA, an early natural language processing systemELIZA that could carry on a limited conversation with a user by imitating the responses ofa Rogerian psychotherapist (Weizenbaum, 1966). ELIZA is a surprisingly simpleprogram that uses pattern matching to recognize phrases like I need X and translatethem into suitable outputs like What would it mean to you if you got X?

/[0-9]/ a single digit “Chapter 1: Down the Rabbit Hole” Figure 2.3 The use of the brackets []plus the dash -to specify a range. The square braces can also be used to specify what a single character cannot be, by use of the caret ^. If the caret ^is the first symbol after the open square brace [, the resulting pattern is negated.

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