Discussion
A scanner for a case insensitive language can be built by
Answer: A
Correct answer: folding the case of letters before or while matching the patterns
The simplest approach converts each letter to a single case as it is read, or uses patterns that accept either case, so that one set of rules serves the whole language. Writing two complete sets doubles the specification for no benefit, and deferring the question to a later phase would leave the scanner unable to recognise keywords at all.
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