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

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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