Discussion
A hand written scanner is sometimes preferred when
Answer: A
Correct answer: the language has unusual rules that patterns express awkwardly
Hand writing is chosen where the lexical structure does not fit the regular expression model comfortably - significant indentation, nested comments, string interpolation, or context-dependent rules such as Fortran’s insignificant blanks. Writing the awkward parts directly is often clearer than forcing them into patterns with elaborate actions and start conditions.
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