Final Exam: Principles of Programming Languages
https://asuce.instructure.com/courses/1344/quizzes/17553?module_item_id=119038 2/20
digit = 4 | 5 | 6 | 7 | 9
Consider the regular expression R = (LETTER | digit | !) •
...
Final Exam: Principles of Programming Languages
https://asuce.instructure.com/courses/1344/quizzes/17553?module_item_id=119038 2/20
digit = 4 | 5 | 6 | 7 | 9
Consider the regular expression R = (LETTER | digit | !) • (letter • digit) • (letter | digit). Which of the following is correct
(more than one choice or no choice can be correct)?
1
*
!5aA ∈ L(R1)
?55aA ∈ L(R1 )
555aA ∈ L(R1 )
Correct! Correct! None of the above
Question 3 1 / 1 pts
Consider the regular expressions:
R = ( a | b )* ( 0*1* ) ( a | b )*
R = ( a | b ) ( 0*1* )* ( a | b )
Which of the following is true?
1 2
a0a ∈ L(R1) and ab01a ∈ L(R2)
Correct! Correct! a0a ∈ L(R1) and ab01a ∉ L(R2)
a0a ∉ L(R1) and ab01a ∈ L(R2)
a0a ∉ L(R1) and ab01a ∉ L(R2)
Question 4 0.33 / 1 pts
letter = a | b | c | d
LETTER = A | B | C | D
digit = 4 | 5 | 6 | 7 | 9
Consider the regular expression R = (digit | ? | !) • (letter • digit ) • (LETTER | letter). Which of the following is correct
(more than one choice or no choice can be correct)?
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