Build a regular expression that captures all nonempty sequences of letters other than file, for, and from.
Question:
Build a regular expression that captures all nonempty sequences of letters other than file, for, and from. For notational convenience, you may assume the existence of a not operator that takes a set of letters as argument and matches any other letter. Comment on the practicality of constructing a regular expression for all sequences of letters other than the keywords of a large programming language.
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We assume for notational convenience that the expression not a 1 a 2 a n is shorthand for b 1 b 2 b ...View the full answer
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